diff --git a/libhwcomposer/hwc_utils.cpp b/libhwcomposer/hwc_utils.cpp
index 6a74625..2fcf06d 100644
--- a/libhwcomposer/hwc_utils.cpp
+++ b/libhwcomposer/hwc_utils.cpp
@@ -856,6 +856,9 @@
     src_w = sourceCrop.right - sourceCrop.left;
     src_h = sourceCrop.bottom - sourceCrop.top;
 
+    if(layer->transform & HWC_TRANSFORM_ROT_90)
+        swap(src_w, src_h);
+
     if(((src_w != dst_w) || (src_h != dst_h)))
         return true;