diff --git a/src/plugins/debugger/gdb/gdbengine.cpp b/src/plugins/debugger/gdb/gdbengine.cpp
index c87ec179116..6b1a53ab96d 100644
--- a/src/plugins/debugger/gdb/gdbengine.cpp
+++ b/src/plugins/debugger/gdb/gdbengine.cpp
@@ -3796,8 +3796,11 @@ static SourcePathMap mergeStartParametersSourcePathMap(const DebuggerRunParamete
 {
     // Do not overwrite user settings.
     SourcePathMap rc = sp.sourcePathMap;
-    for (auto it = in.constBegin(), end = in.constEnd(); it != end; ++it)
-        rc.insert(it.key(), it.value());
+    for (auto it = in.constBegin(), end = in.constEnd(); it != end; ++it) {
+        // Entries that start with parenthesis are handled in CppDebuggerEngine::validateRunParameters
+        if (!it.key().startsWith('('))
+            rc.insert(it.key(), it.value());
+    }
     return rc;
 }