diff --git a/src/awst_build/eb/boolean-expression-builder.ts b/src/awst_build/eb/boolean-expression-builder.ts
index 0eae49e4..7247195c 100644
--- a/src/awst_build/eb/boolean-expression-builder.ts
+++ b/src/awst_build/eb/boolean-expression-builder.ts
@@ -18,7 +18,7 @@ export class BooleanFunctionBuilder extends FunctionBuilder {
     } = parseFunctionArgs({
       args,
       typeArgs,
-      genericTypeArgs: 0,
+      genericTypeArgs: 1,
       callLocation: sourceLocation,
       funcName: 'Boolean',
       argSpec: (a) => [a.optional()],