diff --git a/ytmndd.py b/ytmndd.py
index 4c3e77b..998ef84 100755
--- a/ytmndd.py
+++ b/ytmndd.py
@@ -390,6 +390,10 @@ class YTMND:
             fn.write("  }\n")
             fn.write("  \n")
             fn.write("  document.addEventListener('keydown', function(e) {\n")
+            fn.write("    var modifierKeys = [16, 17, 18];\n")
+            fn.write("    if (modifierKeys.indexOf(e.keyCode) !== -1) {\n")
+            fn.write("      return;\n")
+            fn.write("    }\n")
             fn.write("    if (overlay && overlay.style.display !== 'none') {\n")
             fn.write("      startAudio();\n")
             fn.write("    }\n")