diff --git a/memcheck/mc_main.c b/memcheck/mc_main.c
index 18e67b0..286edea 100644
--- a/memcheck/mc_main.c
+++ b/memcheck/mc_main.c
@@ -808,7 +808,7 @@
          break;
 
       default:
-         VG_(panic)("check_is_readable: Unknown or unexpected CorePart");
+         VG_(panic)("check_is_writable: Unknown or unexpected CorePart");
       }
    }