--- a/mobile/android/geckoview/src/main/java/org/mozilla/gecko/GeckoInputConnection.java
+++ b/mobile/android/geckoview/src/main/java/org/mozilla/gecko/GeckoInputConnection.java
@@ -338,16 +338,17 @@ class GeckoInputConnection
         final Editable editable = getEditable();
         if (imm == null || v == null || editable == null) {
             return;
         }
         imm.updateSelection(v, start, end, getComposingSpanStart(editable),
                             getComposingSpanEnd(editable));
     }
 
+    @TargetApi(21)
     @Override
     public void updateCompositionRects(final RectF[] aRects) {
         if (!(Build.VERSION.SDK_INT >= 21)) {
             return;
         }
 
         if (mCursorAnchorInfoBuilder == null) {
             mCursorAnchorInfoBuilder = new CursorAnchorInfo.Builder();