diff --git a/src/redis-aof-tools.c b/src/redis-aof-tools.c
index 6f9923d7..de7da8f4 100644
--- a/src/redis-aof-tools.c
+++ b/src/redis-aof-tools.c
@@ -57,7 +57,7 @@ int readLong(FILE *fp, char prefix, long *target) {
         return 0;
     }
     if (buf[0] != prefix) {
-        ERROR("Expected prefix '%c', got: '%c'",buf[0],prefix);
+        ERROR("Expected prefix '%c', got: '%c'",prefix,buf[0]);
         return 0;
     }
     *target = strtol(buf+1,&eptr,10);