diff --git a/common.mk b/common.mk
index 857f692fb5..0125645e37 100644
--- a/common.mk
+++ b/common.mk
@@ -1359,7 +1359,7 @@ $(srcdir)/ext/rbconfig/sizeof/limits.c: $(srcdir)/ext/rbconfig/sizeof/depend \
 	$(exec) $(MAKE) -f - $(mflags) \
 		Q=$(Q) ECHO=$(ECHO) top_srcdir=../../.. srcdir=. VPATH=../../.. RUBY="$(BASERUBY)" $(@F)
 
-$(srcdir)/ext/socket/constdefs.c: $(srcdir)/ext/socket/depend
+$(srcdir)/ext/socket/constdefs.c: $(srcdir)/ext/socket/depend $(srcdir)/ext/socket/mkconstants.rb
 	$(Q) $(CHDIR) $(@D) && \
 	$(CAT_DEPEND) depend | \
 	$(exec) $(MAKE) -f - $(mflags) \