diff --git a/src/apps/snmp/snmp_core.c b/src/apps/snmp/snmp_core.c
index 4ffad30f..021c820b 100644
--- a/src/apps/snmp/snmp_core.c
+++ b/src/apps/snmp/snmp_core.c
@@ -636,7 +636,7 @@ snmp_get_node_instance_from_oid(const u32_t *oid, u8_t oid_len, struct snmp_node
     mn = snmp_mib_tree_resolve_exact(mib, oid, oid_len, &oid_instance_len);
     if ((mn != NULL) && (mn->node_type != SNMP_NODE_TREE)) {
       /* get instance */
-      const struct snmp_leaf_node* leaf_node = (const struct snmp_leaf_node*)mn;
+      const struct snmp_leaf_node* leaf_node = (const struct snmp_leaf_node*)(const void*)mn;
 
       node_instance->node = mn;
       snmp_oid_assign(&node_instance->instance_oid, oid + (oid_len - oid_instance_len), oid_instance_len);
@@ -715,7 +715,7 @@ snmp_get_next_node_instance_from_oid(const u32_t *oid, u8_t oid_len, snmp_valida
       node_instance->reference.ptr    = NULL;
       node_instance->reference_len    = 0;
 
-      result = ((const struct snmp_leaf_node*)mn)->get_next_instance(
+      result = ((const struct snmp_leaf_node*)(const void*)mn)->get_next_instance(
         node_oid->id,
         node_oid->len,
         node_instance);
@@ -883,7 +883,7 @@ snmp_mib_tree_resolve_next(const struct snmp_mib *mib, const u32_t *oid, u8_t oi
   }
 
   /* first build node stack related to passed oid (as far as possible), then go backwards to determine the next node */
-  node_stack[nsi] = (const struct snmp_tree_node*)mib->root_node;
+  node_stack[nsi] = (const struct snmp_tree_node*)(const void*)mib->root_node;
   while (oid_offset < oid_len) {
     /* search for matching sub node */
     u32_t i = node_stack[nsi]->subnode_count;
@@ -901,7 +901,7 @@ snmp_mib_tree_resolve_next(const struct snmp_mib *mib, const u32_t *oid, u8_t oi
       break;
     }
     nsi++;
-    node_stack[nsi] = (const struct snmp_tree_node*)(*node);
+    node_stack[nsi] = (const struct snmp_tree_node*)(const void*)(*node);
 
     oid_offset++;
   }
@@ -940,7 +940,7 @@ snmp_mib_tree_resolve_next(const struct snmp_mib *mib, const u32_t *oid, u8_t oi
       if (subnode->node_type == SNMP_NODE_TREE) {
         /* next is a tree node, go into it and start searching */
         nsi++;
-        node_stack[nsi] = (const struct snmp_tree_node*)subnode;
+        node_stack[nsi] = (const struct snmp_tree_node*)(const void*)subnode;
         subnode_oid = 0;
       } else {
         /* we found a leaf node -> fill oidret and return it */
diff --git a/src/apps/snmp/snmp_scalar.c b/src/apps/snmp/snmp_scalar.c
index e7399986..b566a435 100644
--- a/src/apps/snmp/snmp_scalar.c
+++ b/src/apps/snmp/snmp_scalar.c
@@ -49,7 +49,7 @@ static snmp_err_t  snmp_scalar_array_set_value(struct snmp_node_instance* instan
 snmp_err_t 
 snmp_scalar_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance)
 {
-  const struct snmp_scalar_node* scalar_node = (const struct snmp_scalar_node*)instance->node;
+  const struct snmp_scalar_node* scalar_node = (const struct snmp_scalar_node*)(const void*)instance->node;
 
   LWIP_UNUSED_ARG(root_oid);
   LWIP_UNUSED_ARG(root_oid_len);
@@ -89,7 +89,7 @@ snmp_scalar_array_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct
   LWIP_UNUSED_ARG(root_oid_len);
 
   if ((instance->instance_oid.len == 2) && (instance->instance_oid.id[1] == 0)) {
-    const struct snmp_scalar_array_node* array_node = (const struct snmp_scalar_array_node*)instance->node;
+    const struct snmp_scalar_array_node* array_node = (const struct snmp_scalar_array_node*)(const void*)instance->node;
     const struct snmp_scalar_array_node_def* array_node_def = array_node->array_nodes;
     u32_t i = 0;
 
@@ -120,7 +120,7 @@ snmp_scalar_array_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct
 snmp_err_t
 snmp_scalar_array_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance)
 {
-  const struct snmp_scalar_array_node* array_node = (const struct snmp_scalar_array_node*)instance->node;
+  const struct snmp_scalar_array_node* array_node = (const struct snmp_scalar_array_node*)(const void*)instance->node;
   const struct snmp_scalar_array_node_def* array_node_def = array_node->array_nodes;
   const struct snmp_scalar_array_node_def* result = NULL;
 
@@ -193,7 +193,7 @@ snmp_scalar_array_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, st
 static u16_t
 snmp_scalar_array_get_value(struct snmp_node_instance* instance, void* value)
 {
-  const struct snmp_scalar_array_node* array_node = (const struct snmp_scalar_array_node*)instance->node;
+  const struct snmp_scalar_array_node* array_node = (const struct snmp_scalar_array_node*)(const void*)instance->node;
   const struct snmp_scalar_array_node_def* array_node_def = (const struct snmp_scalar_array_node_def*)instance->reference.const_ptr;
 
   return array_node->get_value(array_node_def, value);
@@ -202,7 +202,7 @@ snmp_scalar_array_get_value(struct snmp_node_instance* instance, void* value)
 static snmp_err_t
 snmp_scalar_array_set_test(struct snmp_node_instance* instance, u16_t value_len, void* value)
 {
-  const struct snmp_scalar_array_node* array_node = (const struct snmp_scalar_array_node*)instance->node;
+  const struct snmp_scalar_array_node* array_node = (const struct snmp_scalar_array_node*)(const void*)instance->node;
   const struct snmp_scalar_array_node_def* array_node_def = (const struct snmp_scalar_array_node_def*)instance->reference.const_ptr;
 
   return array_node->set_test(array_node_def, value_len, value);
@@ -211,7 +211,7 @@ snmp_scalar_array_set_test(struct snmp_node_instance* instance, u16_t value_len,
 static snmp_err_t
 snmp_scalar_array_set_value(struct snmp_node_instance* instance, u16_t value_len, void* value)
 {
-  const struct snmp_scalar_array_node* array_node = (const struct snmp_scalar_array_node*)instance->node;
+  const struct snmp_scalar_array_node* array_node = (const struct snmp_scalar_array_node*)(const void*)instance->node;
   const struct snmp_scalar_array_node_def* array_node_def = (const struct snmp_scalar_array_node_def*)instance->reference.const_ptr;
 
   return array_node->set_value(array_node_def, value_len, value);
diff --git a/src/apps/snmp/snmp_table.c b/src/apps/snmp/snmp_table.c
index fa14448d..e3cc71a4 100644
--- a/src/apps/snmp/snmp_table.c
+++ b/src/apps/snmp/snmp_table.c
@@ -46,7 +46,7 @@
 snmp_err_t snmp_table_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance)
 {
   snmp_err_t ret = SNMP_ERR_NOSUCHINSTANCE;
-  const struct snmp_table_node* table_node = (const struct snmp_table_node*)instance->node;
+  const struct snmp_table_node* table_node = (const struct snmp_table_node*)(const void*)instance->node;
 
   LWIP_UNUSED_ARG(root_oid);
   LWIP_UNUSED_ARG(root_oid_len);
@@ -87,7 +87,7 @@ snmp_err_t snmp_table_get_instance(const u32_t *root_oid, u8_t root_oid_len, str
 
 snmp_err_t snmp_table_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance)
 {
-  const struct snmp_table_node* table_node = (const struct snmp_table_node*)instance->node;
+  const struct snmp_table_node* table_node = (const struct snmp_table_node*)(const void*)instance->node;
   const struct snmp_table_col_def* col_def;
   struct snmp_obj_id row_oid;
   u32_t column = 0;
@@ -164,7 +164,7 @@ snmp_err_t snmp_table_get_next_instance(const u32_t *root_oid, u8_t root_oid_len
 snmp_err_t snmp_table_simple_get_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance)
 {
   snmp_err_t ret = SNMP_ERR_NOSUCHINSTANCE;
-  const struct snmp_table_simple_node* table_node = (const struct snmp_table_simple_node*)instance->node;
+  const struct snmp_table_simple_node* table_node = (const struct snmp_table_simple_node*)(const void*)instance->node;
 
   LWIP_UNUSED_ARG(root_oid);
   LWIP_UNUSED_ARG(root_oid_len);
@@ -226,7 +226,7 @@ snmp_err_t snmp_table_simple_get_instance(const u32_t *root_oid, u8_t root_oid_l
 
 snmp_err_t snmp_table_simple_get_next_instance(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance)
 {
-  const struct snmp_table_simple_node* table_node = (const struct snmp_table_simple_node*)instance->node;
+  const struct snmp_table_simple_node* table_node = (const struct snmp_table_simple_node*)(const void*)instance->node;
   const struct snmp_table_simple_col_def* col_def;
   struct snmp_obj_id row_oid;
   u32_t column = 0;
diff --git a/src/apps/snmp/snmp_threadsync.c b/src/apps/snmp/snmp_threadsync.c
index 00f4b472..cbe738f8 100644
--- a/src/apps/snmp/snmp_threadsync.c
+++ b/src/apps/snmp/snmp_threadsync.c
@@ -139,7 +139,7 @@ static void
 get_instance_synced(void* ctx)
 {
   struct threadsync_data *call_data   = (struct threadsync_data*)ctx;
-  const struct snmp_leaf_node *leaf   = (const struct snmp_leaf_node*)call_data->proxy_instance.node;
+  const struct snmp_leaf_node *leaf   = (const struct snmp_leaf_node*)(const void*)call_data->proxy_instance.node;
 
   call_data->retval.u8 = leaf->get_instance(call_data->arg1.root_oid, call_data->arg2.root_oid_len, &call_data->proxy_instance);
 
@@ -150,7 +150,7 @@ static void
 get_next_instance_synced(void* ctx)
 {
   struct threadsync_data *call_data   = (struct threadsync_data*)ctx;
-  const struct snmp_leaf_node *leaf   = (const struct snmp_leaf_node*)call_data->proxy_instance.node;
+  const struct snmp_leaf_node *leaf   = (const struct snmp_leaf_node*)(const void*)call_data->proxy_instance.node;
 
   call_data->retval.u8 = leaf->get_next_instance(call_data->arg1.root_oid, call_data->arg2.root_oid_len, &call_data->proxy_instance);
 
@@ -160,7 +160,7 @@ get_next_instance_synced(void* ctx)
 static snmp_err_t
 do_sync(const u32_t *root_oid, u8_t root_oid_len, struct snmp_node_instance* instance, snmp_threadsync_called_fn fn)
 {
-  const struct snmp_threadsync_node *threadsync_node = (const struct snmp_threadsync_node*)instance->node;
+  const struct snmp_threadsync_node *threadsync_node = (const struct snmp_threadsync_node*)(const void*)instance->node;
   struct threadsync_data *call_data = &threadsync_node->instance->data;
 
   if(threadsync_node->node.node.oid != threadsync_node->target->node.oid) {