diff --git a/lib/string.c b/lib/string.c
index 3206d01..cdd97f4 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -313,12 +313,12 @@
  */
 char *strrchr(const char *s, int c)
 {
-       const char *p = s + strlen(s);
-       do {
-           if (*p == (char)c)
-               return (char *)p;
-       } while (--p >= s);
-       return NULL;
+	const char *last = NULL;
+	do {
+		if (*s == (char)c)
+			last = s;
+	} while (*s++);
+	return (char *)last;
 }
 EXPORT_SYMBOL(strrchr);
 #endif