diff --git a/src/com/android/settings/accessibility/FontSizeData.java b/src/com/android/settings/accessibility/FontSizeData.java
index 56980a4ceba..1de0a5ff7b0 100644
--- a/src/com/android/settings/accessibility/FontSizeData.java
+++ b/src/com/android/settings/accessibility/FontSizeData.java
@@ -16,6 +16,8 @@
 
 package com.android.settings.accessibility;
 
+import static com.android.settings.accessibility.AccessibilityUtil.State.OFF;
+import static com.android.settings.accessibility.AccessibilityUtil.State.ON;
 import static com.android.settings.display.ToggleFontSizePreferenceFragment.fontSizeValueToIndex;
 
 import android.content.ContentResolver;
@@ -52,6 +54,12 @@ final class FontSizeData extends PreviewSizeData<Float> {
     @Override
     void commit(int currentProgress) {
         final ContentResolver resolver = getContext().getContentResolver();
+        if (Settings.Secure.getInt(resolver,
+                Settings.Secure.ACCESSIBILITY_FONT_SCALING_HAS_BEEN_CHANGED,
+                /* def= */ OFF) != ON) {
+            Settings.Secure.putInt(resolver,
+                    Settings.Secure.ACCESSIBILITY_FONT_SCALING_HAS_BEEN_CHANGED, ON);
+        }
         Settings.System.putFloat(resolver, Settings.System.FONT_SCALE,
                 getValues().get(currentProgress));
     }
diff --git a/tests/robotests/src/com/android/settings/accessibility/FontSizeDataTest.java b/tests/robotests/src/com/android/settings/accessibility/FontSizeDataTest.java
index 7e357140811..adf7495a069 100644
--- a/tests/robotests/src/com/android/settings/accessibility/FontSizeDataTest.java
+++ b/tests/robotests/src/com/android/settings/accessibility/FontSizeDataTest.java
@@ -16,6 +16,9 @@
 
 package com.android.settings.accessibility;
 
+import static com.android.settings.accessibility.AccessibilityUtil.State.OFF;
+import static com.android.settings.accessibility.AccessibilityUtil.State.ON;
+
 import static com.google.common.truth.Truth.assertThat;
 
 import android.content.Context;
@@ -52,4 +55,19 @@ public class FontSizeDataTest {
 
         assertThat(currentScale).isEqualTo(mFontSizeData.getValues().get(progress));
     }
+
+    @Test
+    public void commit_fontScalingHasBeenChangedIsOn() {
+        final int progress = 3;
+        Settings.Secure.putInt(mContext.getContentResolver(),
+                Settings.Secure.ACCESSIBILITY_FONT_SCALING_HAS_BEEN_CHANGED, OFF);
+
+        mFontSizeData.commit(progress);
+        final int currentSettings = Settings.Secure.getInt(
+                mContext.getContentResolver(),
+                Settings.Secure.ACCESSIBILITY_FONT_SCALING_HAS_BEEN_CHANGED,
+                /* def= */ OFF);
+
+        assertThat(currentSettings).isEqualTo(ON);
+    }
 }