diff --git a/services/core/java/com/android/server/policy/PhoneWindowManager.java b/services/core/java/com/android/server/policy/PhoneWindowManager.java
index 449801da426cf..96b37bf0b4cb9 100644
--- a/services/core/java/com/android/server/policy/PhoneWindowManager.java
+++ b/services/core/java/com/android/server/policy/PhoneWindowManager.java
@@ -3409,7 +3409,8 @@ public class PhoneWindowManager implements WindowManagerPolicy {
             case KeyEvent.KEYCODE_SPACE:
                 if (down && repeatCount == 0) {
                     // Handle keyboard layout switching. (CTRL + SPACE)
-                    if (KeyEvent.metaStateHasModifiers(metaState, KeyEvent.META_CTRL_ON)) {
+                    if (KeyEvent.metaStateHasModifiers(metaState & ~KeyEvent.META_SHIFT_MASK,
+                            KeyEvent.META_CTRL_ON)) {
                         int direction = (metaState & KeyEvent.META_SHIFT_MASK) != 0 ? -1 : 1;
                         mWindowManagerFuncs.switchKeyboardLayout(event.getDeviceId(), direction);
                         return true;
diff --git a/services/tests/wmtests/src/com/android/server/policy/ModifierShortcutTests.java b/services/tests/wmtests/src/com/android/server/policy/ModifierShortcutTests.java
index 369e8f14ff743..3ecbbfeed254a 100644
--- a/services/tests/wmtests/src/com/android/server/policy/ModifierShortcutTests.java
+++ b/services/tests/wmtests/src/com/android/server/policy/ModifierShortcutTests.java
@@ -27,6 +27,7 @@ import static android.view.KeyEvent.KEYCODE_META_LEFT;
 import static android.view.KeyEvent.KEYCODE_N;
 import static android.view.KeyEvent.KEYCODE_P;
 import static android.view.KeyEvent.KEYCODE_S;
+import static android.view.KeyEvent.KEYCODE_SHIFT_LEFT;
 import static android.view.KeyEvent.KEYCODE_SLASH;
 import static android.view.KeyEvent.KEYCODE_SPACE;
 import static android.view.KeyEvent.KEYCODE_TAB;
@@ -35,10 +36,15 @@ import static android.view.KeyEvent.KEYCODE_Z;
 
 import android.content.Intent;
 import android.os.RemoteException;
+import android.platform.test.annotations.Presubmit;
 import android.util.SparseArray;
 
+import androidx.test.filters.SmallTest;
+
 import org.junit.Test;
 
+@Presubmit
+@SmallTest
 public class ModifierShortcutTests extends ShortcutKeyTestBase {
     private static final SparseArray<String> META_SHORTCUTS =  new SparseArray<>();
     static {
@@ -82,7 +88,16 @@ public class ModifierShortcutTests extends ShortcutKeyTestBase {
     @Test
     public void testCtrlSpace() {
         sendKeyCombination(new int[]{KEYCODE_CTRL_LEFT, KEYCODE_SPACE}, 0);
-        mPhoneWindowManager.assertSwitchKeyboardLayout();
+        mPhoneWindowManager.assertSwitchKeyboardLayout(1);
+    }
+
+    /**
+     * CTRL + SHIFT + SPACE to switch keyboard layout backwards.
+     */
+    @Test
+    public void testCtrlShiftSpace() {
+        sendKeyCombination(new int[]{KEYCODE_CTRL_LEFT, KEYCODE_SHIFT_LEFT, KEYCODE_SPACE}, 0);
+        mPhoneWindowManager.assertSwitchKeyboardLayout(-1);
     }
 
     /**
@@ -91,7 +106,16 @@ public class ModifierShortcutTests extends ShortcutKeyTestBase {
     @Test
     public void testMetaSpace() {
         sendKeyCombination(new int[]{KEYCODE_META_LEFT, KEYCODE_SPACE}, 0);
-        mPhoneWindowManager.assertSwitchKeyboardLayout();
+        mPhoneWindowManager.assertSwitchKeyboardLayout(1);
+    }
+
+    /**
+     * META + SHIFT + SPACE to switch keyboard layout backwards.
+     */
+    @Test
+    public void testMetaShiftSpace() {
+        sendKeyCombination(new int[]{KEYCODE_META_LEFT, KEYCODE_SHIFT_LEFT, KEYCODE_SPACE}, 0);
+        mPhoneWindowManager.assertSwitchKeyboardLayout(-1);
     }
 
     /**
diff --git a/services/tests/wmtests/src/com/android/server/policy/TestPhoneWindowManager.java b/services/tests/wmtests/src/com/android/server/policy/TestPhoneWindowManager.java
index 6e7e005fc0a38..6da9d0c606cff 100644
--- a/services/tests/wmtests/src/com/android/server/policy/TestPhoneWindowManager.java
+++ b/services/tests/wmtests/src/com/android/server/policy/TestPhoneWindowManager.java
@@ -415,9 +415,9 @@ class TestPhoneWindowManager {
         verify(mStatusBarManagerInternal).showRecentApps(anyBoolean());
     }
 
-    void assertSwitchKeyboardLayout() {
+    void assertSwitchKeyboardLayout(int direction) {
         waitForIdle();
-        verify(mWindowManagerFuncsImpl).switchKeyboardLayout(anyInt(), anyInt());
+        verify(mWindowManagerFuncsImpl).switchKeyboardLayout(anyInt(), eq(direction));
     }
 
     void assertTakeBugreport() {