combine in the specified order
diff --git a/Makefile b/Makefile
index 10d85b0..0faccce 100644
--- a/Makefile
+++ b/Makefile
@@ -53,7 +53,7 @@
 include $(PGXS)
 
 # generate combined sql
-$(SQL_INSTALL): $(sort $(SQL_MODULES))
+$(SQL_INSTALL): $(SQL_MODULES)
 	cat $^ > $@
 
 install: $(SQL_INSTALL)