diff --git a/ext/prism/depend b/ext/prism/depend
new file mode 100644
index 0000000000..ac0e7a9bb3
--- /dev/null
+++ b/ext/prism/depend
@@ -0,0 +1,2 @@
+$(OBJS): $(HDRS) $(ruby_headers)
+$(OBJS): $(srcdir)/../../config.yml
diff --git a/prism.gemspec b/prism.gemspec
index c5c315fc8d..eb558ce6c2 100644
--- a/prism.gemspec
+++ b/prism.gemspec
@@ -42,6 +42,8 @@ Gem::Specification.new do |spec|
     "docs/serialization.md",
     "docs/testing.md",
     "ext/prism/api_node.c",
+    "ext/prism/depend",
+    "ext/prism/extconf.rb",
     "ext/prism/extension.c",
     "ext/prism/extension.h",
     "include/prism.h",