diff --git a/src/lib/testutils/sandbox.h b/src/lib/testutils/sandbox.h
index f030034e8f..b2bbe3664b 100644
--- a/src/lib/testutils/sandbox.h
+++ b/src/lib/testutils/sandbox.h
@@ -58,7 +58,7 @@ public:
     ///
     /// @param file A path to file that should be joined to base path of sandbox.
     std::string join(std::string file) {
-        return(path_ + "/" + file);
+        return (path_ + "/" + file);
     }
 };