diff --git a/src/alloc-override.c b/src/alloc-override.c
index ca508aa6..84a0d19d 100644
--- a/src/alloc-override.c
+++ b/src/alloc-override.c
@@ -262,7 +262,15 @@ int   reallocarr(void* p, size_t count, size_t size)    { return mi_reallocarr(p
 void* memalign(size_t alignment, size_t size)           { return mi_memalign(alignment, size); }
 void* _aligned_malloc(size_t alignment, size_t size)    { return mi_aligned_alloc(alignment, size); }
 
-#if defined(__GLIBC__) && defined(__linux__)
+#if defined(__wasi__)
+  // forward __libc interface (see PR #667)
+  void* __libc_malloc(size_t size)                      MI_FORWARD1(mi_malloc, size)
+  void* __libc_calloc(size_t count, size_t size)        MI_FORWARD2(mi_calloc, count, size)
+  void* __libc_realloc(void* p, size_t size)            MI_FORWARD2(mi_realloc, p, size)
+  void  __libc_free(void* p)                            MI_FORWARD0(mi_free, p)
+  void* __libc_memalign(size_t alignment, size_t size)  { return mi_memalign(alignment, size); }
+
+#elif defined(__GLIBC__) && defined(__linux__)
   // forward __libc interface (needed for glibc-based Linux distributions)
   void* __libc_malloc(size_t size)                      MI_FORWARD1(mi_malloc,size)
   void* __libc_calloc(size_t count, size_t size)        MI_FORWARD2(mi_calloc,count,size)