diff --git a/graphics/composer/2.1/default/HwcClient.cpp b/graphics/composer/2.1/default/HwcClient.cpp
index 16af94c..5599959 100644
--- a/graphics/composer/2.1/default/HwcClient.cpp
+++ b/graphics/composer/2.1/default/HwcClient.cpp
@@ -934,7 +934,7 @@
         return false;
     }
 
-    auto err = mHal.setLayerPlaneAlpha(mDisplay, mLayer, read());
+    auto err = mHal.setLayerPlaneAlpha(mDisplay, mLayer, readFloat());
     if (err != Error::NONE) {
         mWriter.setError(getCommandLoc(), err);
     }