diff --git a/js/regl/rainPass.js b/js/regl/rainPass.js
index 0a49363..c4f6a87 100644
--- a/js/regl/rainPass.js
+++ b/js/regl/rainPass.js
@@ -20,6 +20,7 @@ const makeComputeDoubleBuffer = (regl, height, width) =>
 		height,
 		wrapT: "clamp",
 		type: "half float",
+		data: Array(width * height * 4).fill(0)
 	});
 
 const numVerticesPerQuad = 2 * 3;