diff --git a/services/surfaceflinger/RenderEngine/GLES20RenderEngine.cpp b/services/surfaceflinger/RenderEngine/GLES20RenderEngine.cpp
index 3161888..d1ee6f8 100644
--- a/services/surfaceflinger/RenderEngine/GLES20RenderEngine.cpp
+++ b/services/surfaceflinger/RenderEngine/GLES20RenderEngine.cpp
@@ -154,12 +154,12 @@
 void GLES20RenderEngine::setViewportAndProjection(size_t vpw, size_t vph, Rect sourceCrop,
                                                   size_t hwh, bool yswap,
                                                   Transform::orientation_flags rotation) {
-    size_t l = sourceCrop.left;
-    size_t r = sourceCrop.right;
+    int32_t l = sourceCrop.left;
+    int32_t r = sourceCrop.right;
 
     // In GL, (0, 0) is the bottom-left corner, so flip y coordinates
-    size_t t = hwh - sourceCrop.top;
-    size_t b = hwh - sourceCrop.bottom;
+    int32_t t = hwh - sourceCrop.top;
+    int32_t b = hwh - sourceCrop.bottom;
 
     mat4 m;
     if (yswap) {