diff --git a/lib/output.js b/lib/output.js
index dc78a5da..90589a2d 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -1016,6 +1016,11 @@ function OutputStream(options) {
             a.forEach(function(exp, i){
                 if (i) output.comma();
                 exp.print(output);
+                // If the final element is a hole, we need to make sure it
+                // doesn't look like a trailing comma, by inserting an actual
+                // trailing comma.
+                if (i === len - 1 && exp instanceof AST_Hole)
+                  output.comma();
             });
             if (len > 0) output.space();
         });
diff --git a/test/compress/arrays.js b/test/compress/arrays.js
index 10fe6eb5..0c3d8ba2 100644
--- a/test/compress/arrays.js
+++ b/test/compress/arrays.js
@@ -1,10 +1,12 @@
 holes_and_undefined: {
     input: {
+        w = [1,,];
         x = [1, 2, undefined];
         y = [1, , 2, ];
         z = [1, undefined, 3];
     }
     expect: {
+        w=[1,,];
         x=[1,2,void 0];
         y=[1,,2];
         z=[1,void 0,3];