diff --git a/src/plugins/debugger/gdb/gdbengine.cpp b/src/plugins/debugger/gdb/gdbengine.cpp
index 197b7db047c..babc74cd947 100644
--- a/src/plugins/debugger/gdb/gdbengine.cpp
+++ b/src/plugins/debugger/gdb/gdbengine.cpp
@@ -1536,7 +1536,7 @@ void GdbEngine::handleHasPython(const GdbResponse &response)
             cmd += ' ';
             cmd += startParameters().startMode == StartRemoteGdb
                ? startParameters().remoteDumperLib
-               : cmd += qtDumperLibraryName().toLocal8Bit();
+               : qtDumperLibraryName().toLocal8Bit();
             postCommand(cmd);
             m_debuggingHelperState = DebuggingHelperLoadTried;
         }