diff --git a/godoc/static/playground.js b/godoc/static/playground.js
index 70e0c802..84011579 100644
--- a/godoc/static/playground.js
+++ b/godoc/static/playground.js
@@ -275,7 +275,7 @@ function PlaygroundOutput(el) {
     }
   
     function keyHandler(e) {
-      if (e.keyCode == 9) { // tab
+      if (e.keyCode == 9 && !e.ctrlKey) { // tab (but not ctrl-tab)
         insertTabs(1);
         e.preventDefault();
         return false;
diff --git a/godoc/static/static.go b/godoc/static/static.go
index 42dfa073..6b288833 100644
--- a/godoc/static/static.go
+++ b/godoc/static/static.go
@@ -2304,7 +2304,7 @@ function PlaygroundOutput(el) {
     }
   
     function keyHandler(e) {
-      if (e.keyCode == 9) { // tab
+      if (e.keyCode == 9 && !e.ctrlKey) { // tab (but not ctrl-tab)
         insertTabs(1);
         e.preventDefault();
         return false;