diff --git a/src/musredit_qt5/mupp/CMakeLists.txt b/src/musredit_qt5/mupp/CMakeLists.txt
index 5611e112..bcdbb482 100644
--- a/src/musredit_qt5/mupp/CMakeLists.txt
+++ b/src/musredit_qt5/mupp/CMakeLists.txt
@@ -101,6 +101,7 @@ if (APPLE)
     MACOSX_BUNDLE_INFO_STRING "mupp is used to plot parameters from musrfit collections."
     MACOSX_BUNDLE_ICON_FILE "mupp.icns"
     MACOSX_BUNDLE_LONG_VERSION_STRING "${mupp_VERSION}"
+    MACOSX_BUNDLE_GUI_IDENTIFIER "ch.psi.lmu.mupp"
     MACOSX_FRAMEWORK_IDENTIFIER ch.psi.mupp
     MACOSX_BUNDLE_COPYRIGHT "Andreas Suter"
     RESOURCE "${RESOURCE_FILES}"
diff --git a/src/musredit_qt6/mupp/CMakeLists.txt b/src/musredit_qt6/mupp/CMakeLists.txt
index c19a7d05..6202c328 100644
--- a/src/musredit_qt6/mupp/CMakeLists.txt
+++ b/src/musredit_qt6/mupp/CMakeLists.txt
@@ -101,6 +101,7 @@ if (APPLE)
     MACOSX_BUNDLE_INFO_STRING "mupp is used to plot parameters from musrfit collections."
     MACOSX_BUNDLE_ICON_FILE "mupp.icns"
     MACOSX_BUNDLE_LONG_VERSION_STRING "${mupp_VERSION}"
+    MACOSX_BUNDLE_GUI_IDENTIFIER "ch.psi.lmu.mupp"
     MACOSX_FRAMEWORK_IDENTIFIER ch.psi.mupp
     MACOSX_BUNDLE_COPYRIGHT "Andreas Suter"
     RESOURCE "${RESOURCE_FILES}"