diff --git a/services/core/java/com/android/server/am/ActivityRecord.java b/services/core/java/com/android/server/am/ActivityRecord.java
index 3ccac9e2f1e49..ff1068e37da49 100755
--- a/services/core/java/com/android/server/am/ActivityRecord.java
+++ b/services/core/java/com/android/server/am/ActivityRecord.java
@@ -444,10 +444,17 @@ final class ActivityRecord {
             return;
         }
         try {
+            // Make sure fontScale is always equal to global. For fullscreen apps, config is
+            // the shared EMPTY config, which has default fontScale of 1.0. We don't want it
+            // to be applied as an override config.
+            Configuration overrideConfig = new Configuration(config);
+            overrideConfig.fontScale = service.mConfiguration.fontScale;
+
             if (DEBUG_CONFIGURATION) Slog.v(TAG, "Sending new config to " + this + " " +
-                    "reportToActivity=" + reportToActivity + " and config: " + config);
+                    "reportToActivity=" + reportToActivity + " and config: " + overrideConfig);
+
             app.thread.scheduleActivityConfigurationChanged(
-                    appToken, new Configuration(config), reportToActivity);
+                    appToken, overrideConfig, reportToActivity);
         } catch (RemoteException e) {
             // If process died, whatever.
         }