diff --git a/src/include/lwip/debug.h b/src/include/lwip/debug.h
index cd6eacff..c6766120 100644
--- a/src/include/lwip/debug.h
+++ b/src/include/lwip/debug.h
@@ -72,8 +72,8 @@
  * -- To disable assertions define LWIP_NOASSERT in arch/cc.h.
  */
 #ifndef LWIP_NOASSERT
-#define LWIP_ASSERT(message, assertion) do { if(!(assertion)) \
-  LWIP_PLATFORM_ASSERT(message); } while(0)
+#define LWIP_ASSERT(message, assertion) do { if (!(assertion)) { \
+  LWIP_PLATFORM_ASSERT(message); }} while(0)
 #ifndef LWIP_PLATFORM_ASSERT
 #error "If you want to use LWIP_ASSERT, LWIP_PLATFORM_ASSERT(message) needs to be defined in your arch/cc.h"
 #endif