diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 49a919e71dd..4103693d03d 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -6204,7 +6204,7 @@ namespace ts {
                             && isTypeIdenticalTo(getTypeOfSymbol(p), getTypeOfPropertyOfType(baseType, p.escapedName)!))) {
                             return [];
                         }
-                        const flag = (modifierFlags & ModifierFlags.Async ? modifierFlags & ~ModifierFlags.Async : modifierFlags) | (isStatic ? ModifierFlags.Static : 0);
+                        const flag = (modifierFlags & ~ModifierFlags.Async) | (isStatic ? ModifierFlags.Static : 0);
                         const name = getPropertyNameNodeForSymbol(p, context);
                         const firstPropertyLikeDecl = find(p.declarations, or(isPropertyDeclaration, isAccessor, isVariableDeclaration, isPropertySignature, isBinaryExpression, isPropertyAccessExpression));
                         if (p.flags & SymbolFlags.Accessor && useAccessors) {