diff --git a/src/hotspot/share/prims/jvm.cpp b/src/hotspot/share/prims/jvm.cpp
index 00bee2cb9b8..fc627894b01 100644
--- a/src/hotspot/share/prims/jvm.cpp
+++ b/src/hotspot/share/prims/jvm.cpp
@@ -1170,7 +1170,7 @@ JVM_ENTRY(jobjectArray, JVM_GetClassInterfaces(JNIEnv *env, jclass cls))
     InstanceKlass* ik = InstanceKlass::cast(klass);
     size = ik->local_interfaces()->length();
   } else {
- assert(klass->is_objArray_klass() || klass->is_typeArray_klass(), "Illegal mirror klass");
+ assert(klass->is_objArray_klass() || klass->is_typeArray_klass() || klass->is_flatArray_klass(), "Illegal mirror klass");
     size = 3;
   }

Add a new test for `Class::getInterfaces`