diff --git a/Makefile b/Makefile
index 43e2f1b..16d26e9 100644
--- a/Makefile
+++ b/Makefile
@@ -61,7 +61,7 @@ docs: docs/ build
 rustlibs: build/o/libsysexits.rlib build/o/libgetopt.rlib \
 	build/o/libstrerror.rlib
 
-build/include/sysexits.h: build
+build/include/sysexits.h: build include/sysexits.h.template
 	cpp -dM -include sysexits.h /dev/null \
 			| grep '^.define EX_' >$@ \
 		|| cpp -dM -include stdlib.h include/sysexits.h.template \