diff --git a/libc/string/memset.c b/libc/string/memset.c
index ed9cdd7c8..41dafb289 100644
--- a/libc/string/memset.c
+++ b/libc/string/memset.c
@@ -34,10 +34,10 @@ void*  memset(void*  dst, int c, size_t n)
     char*  end = q + n;
 
     for (;;) {
-        if (q < end) break; *q++ = (char) c;
-        if (q < end) break; *q++ = (char) c;
-        if (q < end) break; *q++ = (char) c;
-        if (q < end) break; *q++ = (char) c;
+        if (q >= end) break; *q++ = (char) c;
+        if (q >= end) break; *q++ = (char) c;
+        if (q >= end) break; *q++ = (char) c;
+        if (q >= end) break; *q++ = (char) c;
     }
 
   return dst;