diff --git a/ext/readline/depend.gem b/ext/readline/depend.gem
new file mode 100644
index 0000000000..df01bd2a86
--- /dev/null
+++ b/ext/readline/depend.gem
@@ -0,0 +1,4 @@
+# AUTOGENERATED DEPENDENCIES START
+readline.o: $(RUBY_EXTCONF_H)
+readline.o: readline.c
+# AUTOGENERATED DEPENDENCIES END