diff --git a/Exec/Make.Castro b/Exec/Make.Castro
index 3a8ffa20c8..342f5fe97d 100644
--- a/Exec/Make.Castro
+++ b/Exec/Make.Castro
@@ -357,7 +357,7 @@ include $(AMREX_HOME)/Tools/GNUMake/Make.rules
 clean::
 	$(SILENT) $(RM) extern.F90 prob_params_auto.F90 extern_parameters.H extern_parameters_F.H extern_parameters.cpp
 	$(SILENT) $(RM) AMReX_buildInfo.cpp
-	$(SILENT) $(RM) $(CASTRO_AUTO_SOURCE_DIR)/*.H $(CASTRO_AUTO_SOURCE_DIR)/*.[fF]90
+	$(SILENT) $(RM) $(CASTRO_AUTO_SOURCE_DIR)/*.H $(CASTRO_AUTO_SOURCE_DIR)/*.[fF]90 $(CASTRO_AUTO_SOURCE_DIR)/*.cpp
 
 # these files are now created directly in the CASTRO_AUTO_SOURCE_DIR so eventually we
 # can get rid of explicitly removing them (this is for backwards compatibility)