diff --git a/platform/common/vapi-background.js b/platform/common/vapi-background.js
index f0cbcdbb7..297e69b2b 100644
--- a/platform/common/vapi-background.js
+++ b/platform/common/vapi-background.js
@@ -42,7 +42,7 @@ vAPI.cantWebsocket =
 vAPI.canWASM = vAPI.webextFlavor.soup.has('chromium') === false;
 if ( vAPI.canWASM === false ) {
     const csp = manifest.content_security_policy;
-    vAPI.canWASM = csp !== undefined && csp.indexOf("'unsafe-eval'") !== -1;
+    vAPI.canWASM = csp !== undefined && csp.indexOf("'wasm-unsafe-eval'") !== -1;
 }
 
 vAPI.supportsUserStylesheets = vAPI.webextFlavor.soup.has('user_stylesheet');