1 files changed, 2 insertions, 0 deletions
diff --git a/src/postamble.js b/src/postamble.js
index 833590f2..4b3e831d 100644
--- a/src/postamble.js
+++ b/src/postamble.js
@@ -2,6 +2,8 @@
 // === Auto-generated postamble setup entry stuff ===
 
 Module.callMain = function callMain(args) {
+  assert(runDependencies == 0, 'cannot call main when async dependencies remain! (listen on __ATMAIN__)');
+
   args = args || [];
 
   ensureInitRuntime();