diff --git a/src/musredit_qt5/musredit/PDumpOutputHandler.cpp b/src/musredit_qt5/musredit/PDumpOutputHandler.cpp
index 5ad86078..efe7af1f 100644
--- a/src/musredit_qt5/musredit/PDumpOutputHandler.cpp
+++ b/src/musredit_qt5/musredit/PDumpOutputHandler.cpp
@@ -103,7 +103,7 @@ PDumpOutputHandler::~PDumpOutputHandler()
     fProc->waitForFinished();
   }
   if (fProc->state() == QProcess::Running) {
-    QString cmd = "kill -9 "+ fProcPID;
+    QString cmd = "kill -9 "+ QString("%1").arg(fProcPID);
     QString msg = "fProc still running even after Qt kill, will try system kill cmd: "+cmd;
     qDebug() << msg << endl;
     system(cmd.toLatin1());
diff --git a/src/musredit_qt5/musredit/PFitOutputHandler.cpp b/src/musredit_qt5/musredit/PFitOutputHandler.cpp
index 277618d6..76d453f9 100644
--- a/src/musredit_qt5/musredit/PFitOutputHandler.cpp
+++ b/src/musredit_qt5/musredit/PFitOutputHandler.cpp
@@ -106,7 +106,7 @@ PFitOutputHandler::~PFitOutputHandler()
     fProc->waitForFinished();
   }
   if (fProc->state() == QProcess::Running) {
-    QString cmd = "kill -9 "+ fProcPID;
+    QString cmd = "kill -9 "+ QString("%1").arg(fProcPID);
     QString msg = "fProc still running even after Qt kill, will try system kill cmd: "+cmd;
     qDebug() << msg << endl;
     system(cmd.toLatin1());