diff --git a/pxtlib/main.ts b/pxtlib/main.ts
index 88aaec191f27..02c70989b8d2 100644
--- a/pxtlib/main.ts
+++ b/pxtlib/main.ts
@@ -395,7 +395,7 @@ namespace pxt {
         teachertoolUrl?: string; // "/beta---eval"
         isStatic?: boolean;
         verprefix?: string; // "v1"
-        ocvEnabled: boolean;
+        ocvEnabled?: boolean;
     }
 
     export function localWebConfig() {
diff --git a/tests/blocklycompiler-test/test.spec.ts b/tests/blocklycompiler-test/test.spec.ts
index 9e9e7b61b6bc..b38f4978faab 100644
--- a/tests/blocklycompiler-test/test.spec.ts
+++ b/tests/blocklycompiler-test/test.spec.ts
@@ -63,7 +63,6 @@ pxt.webConfig = {
     runUrl: undefined,
     docsUrl: undefined,
     isStatic: undefined,
-    ocvEnabled: undefined,
 };
 
 class BlocklyCompilerTestHost implements pxt.Host {
diff --git a/tests/blocks-test/blocksrunner.ts b/tests/blocks-test/blocksrunner.ts
index 8cea918dbb55..590852166cdb 100644
--- a/tests/blocks-test/blocksrunner.ts
+++ b/tests/blocks-test/blocksrunner.ts
@@ -43,7 +43,6 @@ pxt.webConfig = {
     docsUrl: undefined,
     multiUrl: undefined,
     isStatic: undefined,
-    ocvEnabled: undefined
 };
 
 class BlocklyCompilerTestHost implements pxt.Host {