diff --git a/src/plugins/coreplugin/editormanager/editormanager.cpp b/src/plugins/coreplugin/editormanager/editormanager.cpp
index d6b31857215..ae9ab547806 100644
--- a/src/plugins/coreplugin/editormanager/editormanager.cpp
+++ b/src/plugins/coreplugin/editormanager/editormanager.cpp
@@ -1789,7 +1789,7 @@ void EditorManager::openInExternalEditor()
                 s = c;
             else {
                 s = QLatin1Char('%');
-                cmd += c;
+                s += c;
             }
             cmd += s;
             continue;