diff --git a/core/java/android/widget/NumberPicker.java b/core/java/android/widget/NumberPicker.java
index 4482b5b26aeb7..10e76345c3df8 100644
--- a/core/java/android/widget/NumberPicker.java
+++ b/core/java/android/widget/NumberPicker.java
@@ -66,7 +66,8 @@ public class NumberPicker extends LinearLayout {
     public static final NumberPicker.Formatter TWO_DIGIT_FORMATTER =
             new NumberPicker.Formatter() {
                 final StringBuilder mBuilder = new StringBuilder();
-                final java.util.Formatter mFmt = new java.util.Formatter(mBuilder);
+                final java.util.Formatter mFmt = new java.util.Formatter(
+                        mBuilder, java.util.Locale.US);
                 final Object[] mArgs = new Object[1];
                 public String toString(int value) {
                     mArgs[0] = value;