diff --git a/DrmHwcTwo.h b/DrmHwcTwo.h
index 7a08d64..c75b2e9 100644
--- a/DrmHwcTwo.h
+++ b/DrmHwcTwo.h
@@ -137,7 +137,7 @@
     HWC2::Error SetLayerSurfaceDamage(hwc_region_t damage);
     HWC2::Error SetLayerTransform(int32_t transform);
     HWC2::Error SetLayerVisibleRegion(hwc_region_t visible);
-    HWC2::Error SetLayerZOrder(uint32_t z);
+    HWC2::Error SetLayerZOrder(uint32_t order);
 
    private:
     // sf_type_ stores the initial type given to us by surfaceflinger,
@@ -227,8 +227,9 @@
         hwc_vsync_period_change_constraints_t *vsyncPeriodChangeConstraints,
         hwc_vsync_period_change_timeline_t *outTimeline);
     HWC2::Error SetAutoLowLatencyMode(bool on);
-    HWC2::Error GetSupportedContentTypes(uint32_t *outNumSupportedContentTypes,
-                                         uint32_t *outSupportedContentTypes);
+    HWC2::Error GetSupportedContentTypes(
+        uint32_t *outNumSupportedContentTypes,
+        const uint32_t *outSupportedContentTypes);
 
     HWC2::Error SetContentType(int32_t contentType);
 #endif