diff --git a/command_event.c b/command_event.c
index 22ce6fe241..a8c95fe6d4 100644
--- a/command_event.c
+++ b/command_event.c
@@ -840,6 +840,7 @@ static void event_load_state(const char *path, char *s, size_t len)
 
 static void event_main_state(unsigned cmd)
 {
+   retro_ctx_size_info_t info;
    char path[PATH_MAX_LENGTH] = {0};
    char msg[128]              = {0};
    global_t *global           = global_get_ptr();
@@ -854,7 +855,9 @@ static void event_main_state(unsigned cmd)
    else
       strlcpy(path, global->name.savestate, sizeof(path));
 
-   if (core.retro_serialize_size())
+   core_ctl(CORE_CTL_RETRO_SERIALIZE_SIZE, &info);
+
+   if (info.size)
    {
       switch (cmd)
       {
diff --git a/movie.c b/movie.c
index da3258a0a9..8d84839735 100644
--- a/movie.c
+++ b/movie.c
@@ -22,6 +22,7 @@
 #include <retro_endianness.h>
 
 #include "movie.h"
+#include "libretro_version_1.h"
 #include "content.h"
 #include "general.h"
 #include "msg_hash.h"
@@ -103,6 +104,8 @@ static bool init_playback(bsv_movie_t *handle, const char *path)
 
    if (state_size)
    {
+      retro_ctx_size_info_t info;
+
       handle->state      = (uint8_t*)malloc(state_size);
       handle->state_size = state_size;
       if (!handle->state)
@@ -114,7 +117,9 @@ static bool init_playback(bsv_movie_t *handle, const char *path)
          return false;
       }
 
-      if (core.retro_serialize_size() == state_size)
+      core_ctl(CORE_CTL_RETRO_SERIALIZE_SIZE, &info);
+
+      if (info.size == state_size)
          core.retro_unserialize(handle->state, state_size);
       else
          RARCH_WARN("Movie format seems to have a different serializer version. Will most likely fail.\n");
@@ -127,6 +132,7 @@ static bool init_playback(bsv_movie_t *handle, const char *path)
 
 static bool init_record(bsv_movie_t *handle, const char *path)
 {
+   retro_ctx_size_info_t info;
    uint32_t state_size;
    uint32_t header[4]        = {0};
    uint32_t *content_crc_ptr = NULL;
@@ -144,7 +150,11 @@ static bool init_record(bsv_movie_t *handle, const char *path)
     * BSV1 in a HEX editor, big-endian. */
    header[MAGIC_INDEX]      = swap_if_little32(BSV_MAGIC);
    header[CRC_INDEX]        = swap_if_big32(*content_crc_ptr);
-   state_size               = core.retro_serialize_size();
+
+   core_ctl(CORE_CTL_RETRO_SERIALIZE_SIZE, &info);
+
+   state_size               = info.size;
+
    header[STATE_SIZE_INDEX] = swap_if_big32(state_size);
 
    fwrite(header, 4, sizeof(uint32_t), handle->file);
diff --git a/netplay/netplay_common.c b/netplay/netplay_common.c
index 00435f0784..d0276bc506 100644
--- a/netplay/netplay_common.c
+++ b/netplay/netplay_common.c
@@ -62,14 +62,17 @@ bool np_send_nickname(netplay_t *netplay, int fd)
 
 uint32_t *np_bsv_header_generate(size_t *size, uint32_t magic)
 {
+   retro_ctx_size_info_t info;
    uint32_t *content_crc_ptr;
    uint32_t *header, bsv_header[4] = {0};
-   size_t serialize_size = core.retro_serialize_size();
-   size_t header_size = sizeof(bsv_header) + serialize_size;
+   size_t serialize_size, header_size;
 
-   *size = header_size;
-
-   header = (uint32_t*)malloc(header_size);
+   core_ctl(CORE_CTL_RETRO_SERIALIZE_SIZE, &info);
+   
+   serialize_size = info.size;
+   header_size    = sizeof(bsv_header) + serialize_size;
+   *size          = header_size;
+   header         = (uint32_t*)malloc(header_size);
    if (!header)
       return NULL;
 
@@ -92,6 +95,7 @@ uint32_t *np_bsv_header_generate(size_t *size, uint32_t magic)
 
 bool np_bsv_parse_header(const uint32_t *header, uint32_t magic)
 {
+   retro_ctx_size_info_t info;
    uint32_t *content_crc_ptr;
    uint32_t in_crc, in_magic, in_state_size;
    uint32_t in_bsv = swap_if_little32(header[MAGIC_INDEX]);
@@ -121,11 +125,13 @@ bool np_bsv_parse_header(const uint32_t *header, uint32_t magic)
       return false;
    }
 
+   core_ctl(CORE_CTL_RETRO_SERIALIZE_SIZE, &info);
+
    in_state_size = swap_if_big32(header[STATE_SIZE_INDEX]);
-   if (in_state_size != core.retro_serialize_size())
+   if (in_state_size != info.size)
    {
       RARCH_ERR("Serialization size mismatch, got 0x%x, expected 0x%x.\n",
-            (unsigned)in_state_size, (unsigned)core.retro_serialize_size());
+            (unsigned)in_state_size, (unsigned)info.size);
       return false;
    }
 
diff --git a/netplay/netplay_net.c b/netplay/netplay_net.c
index 4d83bf2577..03e2eeb8ee 100644
--- a/netplay/netplay_net.c
+++ b/netplay/netplay_net.c
@@ -94,6 +94,7 @@ static void netplay_net_post_frame(netplay_t *netplay)
 static bool netplay_net_init_buffers(netplay_t *netplay)
 {
    unsigned i;
+   retro_ctx_size_info_t info;
 
    if (!netplay)
       return false;
@@ -104,7 +105,9 @@ static bool netplay_net_init_buffers(netplay_t *netplay)
    if (!netplay->buffer)
       return false;
 
-   netplay->state_size = core.retro_serialize_size();
+   core_ctl(CORE_CTL_RETRO_SERIALIZE_SIZE, &info);
+
+   netplay->state_size = info.size;
 
    for (i = 0; i < netplay->buffer_size; i++)
    {
diff --git a/rewind.c b/rewind.c
index 4adfc60876..a16f2ea9c5 100644
--- a/rewind.c
+++ b/rewind.c
@@ -618,6 +618,7 @@ static void state_manager_capacity(state_manager_t *state,
 
 void init_rewind(void)
 {
+   retro_ctx_size_info_t info;
    void *state          = NULL;
    settings_t *settings = config_get_ptr();
 
@@ -630,7 +631,9 @@ void init_rewind(void)
       return;
    }
 
-   rewind_state.size = core.retro_serialize_size();
+   core_ctl(CORE_CTL_RETRO_SERIALIZE_SIZE, &info);
+
+   rewind_state.size = info.size;
 
    if (!rewind_state.size)
    {