diff --git a/core/java/android/widget/TimePicker.java b/core/java/android/widget/TimePicker.java
index afca2db9b7b62..62373fc8b45f1 100644
--- a/core/java/android/widget/TimePicker.java
+++ b/core/java/android/widget/TimePicker.java
@@ -212,6 +212,7 @@ public class TimePicker extends FrameLayout {
                     button.requestFocus();
                     mIsAm = !mIsAm;
                     updateAmPmControl();
+                    onTimeChanged();
                 }
             });
         } else {
@@ -226,6 +227,7 @@ public class TimePicker extends FrameLayout {
                     picker.requestFocus();
                     mIsAm = !mIsAm;
                     updateAmPmControl();
+                    onTimeChanged();
                 }
             });
             mAmPmSpinnerInput = (EditText) mAmPmSpinner.findViewById(R.id.numberpicker_input);