diff --git a/src/Makefile.src b/src/Makefile.src
index 1b2160768689da8c705a489ed0e8b6ab6acd0034..9e0ae0db44334a073c415532618e4881086ba242 100644
--- a/src/Makefile.src
+++ b/src/Makefile.src
@@ -227,7 +227,7 @@ lang.o: lang.c config.h object.h interpret.h program.h
 
 $(SRCDIR)/language.h: language.yacc
 	@echo "Expect 1 shift/reduce conflict."
-	$(YACC) $(YFLAGS) $(SRCDIR)/language.y
+	$(YACC) $(YFLAGS) $(SRCDIR)/language.yacc
 	mv y.tab.c $(SRCDIR)/language.c
 	mv y.tab.h $(SRCDIR)/language.h