diff --git a/tinygrad/viz/js/index.js b/tinygrad/viz/js/index.js
index 8a36adca3d..9f0c682249 100644
--- a/tinygrad/viz/js/index.js
+++ b/tinygrad/viz/js/index.js
@@ -184,7 +184,7 @@ const WAVE_COLORS = {VALU:"#ffffc0", SALU:"#cef263", LOAD:"#ffc0c0", STORE:"#4fa
 const waveColor = (op) => {
   const cat = op.includes("VALU") || op === "VINTERP" ? "VALU" : op.includes("SALU") ? "SALU" : op.includes("VMEM") ? "VMEM"
             : op.includes("LOAD") || op === "SMEM" ? "LOAD" : op.includes("STORE") ? "STORE" : op;
-  ret = WAVE_COLORS[cat] ?? "#ffffff";
+  let ret = WAVE_COLORS[cat] ?? "#ffffff";
   if (op.includes("OTHER_") || op.includes("_ALT")) { ret = darkenHex(ret, 75) }
   if (op.includes("LDS_")) { ret = darkenHex(ret, 25) }
   return ret