diff --git a/lang/cpp/src/Makefile.am b/lang/cpp/src/Makefile.am
index 364d2ca8..e9deca9b 100644
--- a/lang/cpp/src/Makefile.am
+++ b/lang/cpp/src/Makefile.am
@@ -93,3 +93,5 @@ uninstall-cmake-files:
 install-data-local: install-cmake-files
 
 uninstall-local: uninstall-cmake-files
+
+CLEANFILES = GpgmeppConfig.cmake