diff --git a/src/plugins/debugger/dap/lldbdapengine.cpp b/src/plugins/debugger/dap/lldbdapengine.cpp
index 5a88ad8c836..af2d1868fad 100644
--- a/src/plugins/debugger/dap/lldbdapengine.cpp
+++ b/src/plugins/debugger/dap/lldbdapengine.cpp
@@ -131,7 +131,7 @@ QJsonArray LldbDapEngine::sourceMap() const
 QJsonArray LldbDapEngine::preRunCommands() const
 {
     const QStringList lines = settings().gdbStartupCommands().split('\n')
-                              + runParameters().additionalStartupCommands.split('\n');
+                              + runParameters().additionalStartupCommands().split('\n');
     QJsonArray result;
     for (const QString &line : lines) {
         const QString trimmed = line.trimmed();
diff --git a/src/plugins/debugger/debuggerengine.cpp b/src/plugins/debugger/debuggerengine.cpp
index aafd4c6e36e..8a870604435 100644
--- a/src/plugins/debugger/debuggerengine.cpp
+++ b/src/plugins/debugger/debuggerengine.cpp
@@ -151,7 +151,7 @@ DebuggerRunParameters DebuggerRunParameters::fromRunControl(ProjectExplorer::Run
         params.m_isQmlDebugging = aspect->useQmlDebugger;
         params.isPythonDebugging = aspect->usePythonDebugger;
         params.multiProcess = aspect->useMultiProcess;
-        params.additionalStartupCommands = aspect->overrideStartup;
+        params.m_additionalStartupCommands = aspect->overrideStartup;
 
         if (aspect->useCppDebugger) {
             if (DebuggerKitAspect::debugger(kit)) {
@@ -2144,7 +2144,7 @@ QString DebuggerEngine::expand(const QString &string) const
 QString DebuggerEngine::nativeStartupCommands() const
 {
     QStringList lines = settings().gdbStartupCommands().split('\n');
-    lines += runParameters().additionalStartupCommands.split('\n');
+    lines += runParameters().additionalStartupCommands().split('\n');
 
     lines = Utils::filtered(lines, [](const QString line) {
         const QString trimmed = line.trimmed();
diff --git a/src/plugins/debugger/debuggerengine.h b/src/plugins/debugger/debuggerengine.h
index 5e1e44e0bbc..771d2acdd1c 100644
--- a/src/plugins/debugger/debuggerengine.h
+++ b/src/plugins/debugger/debuggerengine.h
@@ -176,8 +176,7 @@ public:
     void setSnapshot(bool isSnapshot) { m_isSnapshot = isSnapshot; }
     bool isSnapshot() const { return m_isSnapshot; }
 
-    // Macro-expanded and passed to debugger startup.
-    QString additionalStartupCommands;
+    QString additionalStartupCommands() const { return m_additionalStartupCommands; }
 
     DebuggerEngineType cppEngineType = NoEngineType;
     QString version;
@@ -279,6 +278,9 @@ private:
     // Used by general core file debugging. Public access requested in QTCREATORBUG-17158.
     Utils::FilePath m_coreFile;
     bool m_isSnapshot = false; // Set if created internally.
+
+    // Macro-expanded and passed to debugger startup.
+    QString m_additionalStartupCommands;
 };
 
 namespace Internal {