diff --git a/libc/string/memmem.c b/libc/string/memmem.c
index b6b30053..c4c60716 100644
--- a/libc/string/memmem.c
+++ b/libc/string/memmem.c
@@ -24,7 +24,7 @@ void* memmem(const void* haystack, size_t haystack_size,
              const void* needle, size_t needle_size)
 {
 	if ( !needle_size )
-		return haystack;
+		return (void*) haystack;
 	if ( haystack_size < needle_size )
 		return NULL;
 	for ( size_t i = 0; i < haystack_size - needle_size; i++ )