--- a/src/bin/pgevent/Makefile
+++ b/src/bin/pgevent/Makefile
@@ -30,6 +30,9 @@
 
 include $(top_srcdir)/src/Makefile.shlib
 
+libpgeventdll.def: pgevent.def
+	cp -f $< $@
+
 pgmsgevent.o: pgmsgevent.rc
 	$(WINDRES) $< -o $@ --include-dir=$(top_builddir)/src/include --include-dir=$(top_srcdir)/src/include --include-dir=$(srcdir) --include-dir=.