diff --git a/libc/string/memrchr.c b/libc/string/memrchr.c
index a533fef..aeb5643 100644
--- a/libc/string/memrchr.c
+++ b/libc/string/memrchr.c
@@ -35,10 +35,10 @@
         const char*  q = p + n;
 
         while (1) {
-            q--; if (q < p || q[0] == c) break;
-            q--; if (q < p || q[0] == c) break;
-            q--; if (q < p || q[0] == c) break;
-            q--; if (q < p || q[0] == c) break;
+            q--; if (q < p || q[0] == (char) c) break;
+            q--; if (q < p || q[0] == (char) c) break;
+            q--; if (q < p || q[0] == (char) c) break;
+            q--; if (q < p || q[0] == (char) c) break;
         }
         if (q >= p)
             return (void*)q;