diff --git a/interpreter/cling/lib/MetaProcessor/MetaProcessor.cpp b/interpreter/cling/lib/MetaProcessor/MetaProcessor.cpp
index 84cc30ac46d33f26376fc7f4523c34b348660885..d6327dd5458c839810f3f826d8522867f1cdc2ea 100644
--- a/interpreter/cling/lib/MetaProcessor/MetaProcessor.cpp
+++ b/interpreter/cling/lib/MetaProcessor/MetaProcessor.cpp
@@ -137,7 +137,7 @@ namespace cling {
 
     // Restore stdstream from backup and close the backup
     void close(int oldfd, int newfd) {
-      assert(newfd == STDOUT_FILENO || newfd == STDERR_FILENO && "Not std FD");
+      assert(newfd == STDOUT_FILENO || (newfd == STDERR_FILENO && "Not std FD"));
       assert(oldfd == m_Bak[newfd == STDERR_FILENO] && "Not backup FD");
       if (oldfd != kInvalidFD) {
         dup2(oldfd, newfd, "RedirectOutput::close");