diff --git a/tools/makeparallel/makeparallel.cpp b/tools/makeparallel/makeparallel.cpp
index 576fe8d..cf125fa 100644
--- a/tools/makeparallel/makeparallel.cpp
+++ b/tools/makeparallel/makeparallel.cpp
@@ -343,7 +343,7 @@
     // child
     int ret = execvp(path, args.data());
     if (ret < 0) {
-      error(errno, errno, "exec failed");
+      error(errno, errno, "exec %s failed", path);
     }
     abort();
   }