diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 9e5db9d1601..98d9e8164f2 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -113,7 +113,7 @@ install: all installdirs install-lib
 	$(INSTALL_DATA) $(srcdir)/pqexpbuffer.h '$(DESTDIR)$(includedir_internal)'
 	$(INSTALL_DATA) $(srcdir)/pg_service.conf.sample '$(DESTDIR)$(datadir)/pg_service.conf.sample'
 ifneq (,$(findstring $(PORTNAME), win32 cygwin))
-	$(INSTALL_DATA) $(shlib) '$(DESTDIR)$(bindir)/$(shlib)'
+	$(INSTALL_SHLIB) $(shlib) '$(DESTDIR)$(bindir)/$(shlib)'
 endif
 
 installdirs: installdirs-lib