diff --git a/src/utils/parseViyaDebugResponse.ts b/src/utils/parseViyaDebugResponse.ts
index d3d3e6e..f5e4e54 100644
--- a/src/utils/parseViyaDebugResponse.ts
+++ b/src/utils/parseViyaDebugResponse.ts
@@ -16,10 +16,15 @@ export const parseSasViyaDebugResponse = async (
   requestClient: RequestClient,
   serverUrl: string
 ) => {
+  // On viya 3.5, iframe is like <iframe style="width: 99%; height: 500px" src="..."></iframe>
+  // On viya 4, iframe is like <iframe style="width: 99%; height: 500px; background-color:Canvas;" src=...></iframe>
+
   const iframeStart = response.split(
-    '<iframe style="width: 99%; height: 500px" src="'
+    /<iframe style="width: 99%; height: 500px" src="|<iframe style="width: 99%; height: 500px; background-color:Canvas;" src=/
   )[1]
-  const jsonUrl = iframeStart ? iframeStart.split('"></iframe>')[0] : null
+  const jsonUrl = iframeStart
+    ? iframeStart.split(/"><\/iframe>|><\/iframe>/)[0]
+    : null
   if (!jsonUrl) {
     throw new Error('Unable to find webout file URL.')
   }