diff --git a/lib/libc+tcc.c b/lib/libc+tcc.c
index 65195bfa..5832f7a9 100644
--- a/lib/libc+tcc.c
+++ b/lib/libc+tcc.c
@@ -335,11 +335,17 @@ memset (void *s, int c, size_t n)
 }
 
 int
-memcmp (void const *s1, void const *s2, size_t n)
+memcmp (void const *s1, void const *s2, size_t size)
 {
+  if (!size)
+    return 0;
   char *a = s1;
   char *b = s2;
-  while (*a == *b && --n) {a++;b++;}
+  while (*a == *b && --size)
+    {
+      a++;
+      b++;
+    }
   return *a - *b;
 }