diff --git a/src/utilities/buildASTSchema.js b/src/utilities/buildASTSchema.js
index 869f3c6f4b..f33fb7aa0b 100644
--- a/src/utilities/buildASTSchema.js
+++ b/src/utilities/buildASTSchema.js
@@ -71,10 +71,7 @@ export function buildASTSchema(
     assertValidSDL(documentAST);
   }
 
-  const config = extendSchemaImpl(emptySchemaConfig, documentAST, {
-    ...options,
-    assumeValidSDL: true,
-  });
+  const config = extendSchemaImpl(emptySchemaConfig, documentAST, options);
 
   if (config.astNode == null) {
     for (const type of config.types) {