diff --git a/src/gpu/GrGLRenderTarget.cpp b/src/gpu/GrGLRenderTarget.cpp
index 290ae2e..c98914a 100644
--- a/src/gpu/GrGLRenderTarget.cpp
+++ b/src/gpu/GrGLRenderTarget.cpp
@@ -36,8 +36,6 @@
                 texture,
                 viewport.fWidth,
                 viewport.fHeight,
-                texture->allocatedWidth(),
-                texture->allocatedHeight(),
                 desc.fConfig,
                 desc.fSampleCnt) {
     GrAssert(NULL != texID);
@@ -45,6 +43,11 @@
     // FBO 0 can't also be a texture, right?
     GrAssert(0 != desc.fRTFBOID);
     GrAssert(0 != desc.fTexFBOID);
+
+    // we assume this is true, TODO: get rid of viewport as a param.
+    GrAssert(viewport.fWidth == texture->width());
+    GrAssert(viewport.fHeight == texture->height());
+
     this->init(desc, viewport, texID);
 }
 
@@ -55,8 +58,6 @@
                 NULL,
                 viewport.fWidth,
                 viewport.fHeight,
-                viewport.fWidth,   // don't really need separate alloc w/h for
-                viewport.fHeight,  // non-texture RTs, repeat viewport values
                 desc.fConfig,
                 desc.fSampleCnt) {
     this->init(desc, viewport, NULL);