diff --git a/nuklear.h b/nuklear.h
index 8f2b3ef..12fa7ab 100644
--- a/nuklear.h
+++ b/nuklear.h
@@ -5804,7 +5804,7 @@ struct nk_context {
 #define NK_ALIGN_PTR_BACK(x, mask)\
     (NK_UINT_TO_PTR((NK_PTR_TO_UINT((nk_byte*)(x)) & ~(mask-1))))
 
-#if (defined(__GNUC__) && __GNUC__ >= 4) || defined(__clang__)
+#if ((defined(__GNUC__) && __GNUC__ >= 4) || defined(__clang__)) && !defined(EMSCRIPTEN)
 #define NK_OFFSETOF(st,m) (__builtin_offsetof(st,m))
 #else
 #define NK_OFFSETOF(st,m) ((nk_ptr)&(((st*)0)->m))
diff --git a/src/nuklear.h b/src/nuklear.h
index 43afb1d..7c627e9 100644
--- a/src/nuklear.h
+++ b/src/nuklear.h
@@ -5582,7 +5582,7 @@ struct nk_context {
 #define NK_ALIGN_PTR_BACK(x, mask)\
     (NK_UINT_TO_PTR((NK_PTR_TO_UINT((nk_byte*)(x)) & ~(mask-1))))
 
-#if (defined(__GNUC__) && __GNUC__ >= 4) || defined(__clang__)
+#if ((defined(__GNUC__) && __GNUC__ >= 4) || defined(__clang__)) && !defined(EMSCRIPTEN)
 #define NK_OFFSETOF(st,m) (__builtin_offsetof(st,m))
 #else
 #define NK_OFFSETOF(st,m) ((nk_ptr)&(((st*)0)->m))