diff --git a/lib/compress.js b/lib/compress.js
index b1fbdf25..f96fb04a 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -1025,6 +1025,7 @@ merge(Compressor.prototype, {
             var n = this.body.length;
             return n > 0 && aborts(this.body[n - 1]);
         };
+        def(AST_Import, function(){ return null; });
         def(AST_BlockStatement, block_aborts);
         def(AST_SwitchBranch, block_aborts);
         def(AST_If, function(){