diff --git a/bin/compile b/bin/compile
index d345b131f953140c8e2702d930ae95ec1fdfc622..1e2442508e21237e5e74c9a1b57c822bdf8a1866 100755
--- a/bin/compile
+++ b/bin/compile
@@ -109,6 +109,12 @@ export PKG_CONFIG_PATH=/app/.heroku/vendor/lib/pkg-config:$BUILD_DIR/.heroku/ven
 # Switch to the repo's context.
 cd $BUILD_DIR
 
+# Warn for lack of Procfile.
+if [[ ! -f Procfile ]]; then
+  puts-warn 'Warning: Your application is missing a Procfile. This file tells Heroku how to run your application.'
+  puts-warn 'Learn more: https://devcenter.heroku.com/articles/procfile'
+fi
+
 # Experimental pre_compile hook.
 bpwatch start pre_compile
   source $BIN_DIR/steps/hooks/pre_compile