diff --git a/Makefile.in b/Makefile.in
index e474cd4ba2cf..d0b23726a5c9 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -336,6 +336,7 @@ $(srcdir)/Lib/$(PLATDIR):
 		cp $(srcdir)/Lib/plat-generic/regen $(srcdir)/Lib/$(PLATDIR)/regen
 		export PATH; PATH="`pwd`:$$PATH"; \
 		export PYTHONPATH; PYTHONPATH="`pwd`/Lib"; \
+		export EXE; EXE="$(EXE)"; \
 		cd $(srcdir)/Lib/$(PLATDIR); ./regen
 
 # Install the include files