diff --git a/ntoskrnl/ex/uuid.c b/ntoskrnl/ex/uuid.c
index b196d6e9833..07530161d29 100644
--- a/ntoskrnl/ex/uuid.c
+++ b/ntoskrnl/ex/uuid.c
@@ -394,7 +394,6 @@ ExUuidCreate(OUT UUID *Uuid)
         {
             Time.QuadPart = ExpUuidCachedValues.Time;
 
-            C_ASSERT(sizeof(ExpUuidCachedValues.GuidInit) == sizeof(Uuid->Data4));
             RtlCopyMemory(Uuid->Data4,
                           ExpUuidCachedValues.GuidInit,
                           sizeof(Uuid->Data4));
diff --git a/ntoskrnl/include/internal/ex.h b/ntoskrnl/include/internal/ex.h
index 5ec4a8434f5..fae2026fc1c 100644
--- a/ntoskrnl/include/internal/ex.h
+++ b/ntoskrnl/include/internal/ex.h
@@ -183,6 +183,8 @@ typedef struct _UUID_CACHED_VALUES_STRUCT
     };
 } UUID_CACHED_VALUES_STRUCT, *PUUID_CACHED_VALUES_STRUCT;
 
+C_ASSERT(RTL_FIELD_SIZE(UUID_CACHED_VALUES_STRUCT, GuidInit) == RTL_FIELD_SIZE(UUID, Data4));
+
 /* INITIALIZATION FUNCTIONS *************************************************/
 
 BOOLEAN