diff --git a/src/gpu.js b/src/gpu.js
index e938fd78..b17cbefa 100644
--- a/src/gpu.js
+++ b/src/gpu.js
@@ -138,6 +138,11 @@ module.exports = class GPU {
 		} else {
 			fn = arguments[arguments.length - 1];
 		}
+		
+		if (!utils.isWebGlDrawBuffersSupported) {
+			this._runner = new CPURunner(settings);
+		}
+		
 		const kernel = this.createKernel(fn, settings);
 		if (Array.isArray(arguments[0])) {
 			const functions = arguments[0];
diff --git a/test/src/features/create-kernels.js b/test/src/features/create-kernels.js
index 1b4aded2..d86aae1a 100644
--- a/test/src/features/create-kernels.js
+++ b/test/src/features/create-kernels.js
@@ -31,7 +31,7 @@ function createArrayKernels(mode, dimensions, canvas) {
 function createKernel(mode, dimensions, canvas) {
   var gpu = new GPU({mode: mode, canvas: canvas});
   return gpu.createKernel(function (a) {
-    return a[this.thread.x][this.thread.y];
+    return a[this.thread.x];
   }).setDimensions(dimensions);
 }