diff --git a/java/src/com/android/inputmethod/compat/InputMethodSubtypeCompatUtils.java b/java/src/com/android/inputmethod/compat/InputMethodSubtypeCompatUtils.java
index b119d6c..4ea7fb8 100644
--- a/java/src/com/android/inputmethod/compat/InputMethodSubtypeCompatUtils.java
+++ b/java/src/com/android/inputmethod/compat/InputMethodSubtypeCompatUtils.java
@@ -19,7 +19,10 @@
 import android.os.Build;
 import android.view.inputmethod.InputMethodSubtype;
 
+import com.android.inputmethod.latin.Constants;
+
 import java.lang.reflect.Constructor;
+import java.lang.reflect.Method;
 
 public final class InputMethodSubtypeCompatUtils {
     private static final String TAG = InputMethodSubtypeCompatUtils.class.getSimpleName();
@@ -37,6 +40,12 @@
             }
         }
     }
+
+    // Note that {@link InputMethodSubtype#isAsciiCapable()} has been introduced in API level 19
+    // (Build.VERSION_CODE.KITKAT).
+    private static final Method METHOD_isAsciiCapable = CompatUtils.getMethod(
+            InputMethodSubtype.class, "isAsciiCapable");
+
     private InputMethodSubtypeCompatUtils() {
         // This utility class is not publicly instantiable.
     }
@@ -53,4 +62,9 @@
                 nameId, iconId, locale, mode, extraValue, isAuxiliary,
                 overridesImplicitlyEnabledSubtype, id);
     }
+
+    public static boolean isAsciiCapable(final InputMethodSubtype subtype) {
+        return (Boolean)CompatUtils.invoke(subtype, false, METHOD_isAsciiCapable)
+                || subtype.containsExtraValueKey(Constants.Subtype.ExtraValue.ASCII_CAPABLE);
+    }
 }
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java b/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java
index e5b814f..cde5091 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardLayoutSet.java
@@ -20,7 +20,6 @@
 import static com.android.inputmethod.latin.Constants.ImeOption.NO_MICROPHONE;
 import static com.android.inputmethod.latin.Constants.ImeOption.NO_MICROPHONE_COMPAT;
 import static com.android.inputmethod.latin.Constants.ImeOption.NO_SETTINGS_KEY;
-import static com.android.inputmethod.latin.Constants.Subtype.ExtraValue.ASCII_CAPABLE;
 
 import android.content.Context;
 import android.content.res.Resources;
@@ -34,6 +33,7 @@
 import android.view.inputmethod.InputMethodSubtype;
 
 import com.android.inputmethod.compat.EditorInfoCompatUtils;
+import com.android.inputmethod.compat.InputMethodSubtypeCompatUtils;
 import com.android.inputmethod.keyboard.internal.KeyboardBuilder;
 import com.android.inputmethod.keyboard.internal.KeyboardParams;
 import com.android.inputmethod.keyboard.internal.KeysCache;
@@ -248,7 +248,7 @@
         }
 
         public Builder setSubtype(final InputMethodSubtype subtype) {
-            final boolean asciiCapable = subtype.containsExtraValueKey(ASCII_CAPABLE);
+            final boolean asciiCapable = InputMethodSubtypeCompatUtils.isAsciiCapable(subtype);
             @SuppressWarnings("deprecation")
             final boolean deprecatedForceAscii = InputAttributes.inPrivateImeOptions(
                     mPackageName, FORCE_ASCII, mParams.mEditorInfo);
diff --git a/java/src/com/android/inputmethod/latin/settings/AdditionalSubtypeSettings.java b/java/src/com/android/inputmethod/latin/settings/AdditionalSubtypeSettings.java
index 4bf524c..6dae620 100644
--- a/java/src/com/android/inputmethod/latin/settings/AdditionalSubtypeSettings.java
+++ b/java/src/com/android/inputmethod/latin/settings/AdditionalSubtypeSettings.java
@@ -16,8 +16,6 @@
 
 package com.android.inputmethod.latin.settings;
 
-import static com.android.inputmethod.latin.Constants.Subtype.ExtraValue.ASCII_CAPABLE;
-
 import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.Context;
@@ -44,6 +42,8 @@
 import android.widget.SpinnerAdapter;
 import android.widget.Toast;
 
+import com.android.inputmethod.compat.InputMethodSubtypeCompatUtils;
+import com.android.inputmethod.latin.Constants;
 import com.android.inputmethod.latin.R;
 import com.android.inputmethod.latin.RichInputMethodManager;
 import com.android.inputmethod.latin.utils.AdditionalSubtypeUtils;
@@ -111,7 +111,7 @@
                             subtype.getLocale(), subtype.hashCode(), subtype.hashCode(),
                             SubtypeLocaleUtils.getSubtypeDisplayNameInSystemLocale(subtype)));
                 }
-                if (subtype.containsExtraValueKey(ASCII_CAPABLE)) {
+                if (InputMethodSubtypeCompatUtils.isAsciiCapable(subtype)) {
                     items.add(createItem(context, subtype.getLocale()));
                 }
             }
@@ -287,7 +287,7 @@
                 final KeyboardLayoutSetItem layout =
                         (KeyboardLayoutSetItem) mKeyboardLayoutSetSpinner.getSelectedItem();
                 final InputMethodSubtype subtype = AdditionalSubtypeUtils.createAdditionalSubtype(
-                        locale.first, layout.first, ASCII_CAPABLE);
+                        locale.first, layout.first, Constants.Subtype.ExtraValue.ASCII_CAPABLE);
                 setSubtype(subtype);
                 notifyChanged();
                 if (isEditing) {