diff --git a/conformance-suites/1.0.3/conformance/extensions/webgl-compressed-texture-pvrtc.html b/conformance-suites/1.0.3/conformance/extensions/webgl-compressed-texture-pvrtc.html
index 3271508104..02c88d5d5c 100644
--- a/conformance-suites/1.0.3/conformance/extensions/webgl-compressed-texture-pvrtc.html
+++ b/conformance-suites/1.0.3/conformance/extensions/webgl-compressed-texture-pvrtc.html
@@ -271,7 +271,7 @@
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "uploading compressed texture");
     gl.generateMipmap(gl.TEXTURE_2D);
     wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "trying to generate mipmaps from compressed texture");
-    wtu.drawQuad(gl);
+    wtu.clearAndDrawUnitQuad(gl);
     compareRect(width, height, test.channels, width, height, uncompressedData, data, format);
 
     gl.compressedTexImage2D(gl.TEXTURE_2D, 0, format, width, height, 1, data);
diff --git a/conformance-suites/2.0.0/conformance/extensions/webgl-compressed-texture-pvrtc.html b/conformance-suites/2.0.0/conformance/extensions/webgl-compressed-texture-pvrtc.html
index bae1af67d1..2a14f68a77 100644
--- a/conformance-suites/2.0.0/conformance/extensions/webgl-compressed-texture-pvrtc.html
+++ b/conformance-suites/2.0.0/conformance/extensions/webgl-compressed-texture-pvrtc.html
@@ -273,7 +273,7 @@
     wtu.glErrorShouldBe(gl, gl.NO_ERROR, "uploading compressed texture");
     gl.generateMipmap(gl.TEXTURE_2D);
     wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "trying to generate mipmaps from compressed texture");
-    wtu.drawQuad(gl);
+    wtu.clearAndDrawUnitQuad(gl);
     compareRect(width, height, test.channels, width, height, uncompressedData, data, format, undefined, "NEAREST");
     // Test again with linear filtering.
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);