diff --git a/squirrel/sqclass.cpp b/squirrel/sqclass.cpp
index fc61961..53a2976 100644
--- a/squirrel/sqclass.cpp
+++ b/squirrel/sqclass.cpp
@@ -61,6 +61,9 @@ bool SQClass::NewSlot(SQSharedState *ss,const SQObjectPtr &key,const SQObjectPtr
         _defaultvalues[_member_idx(temp)].val = val;
         return true;
     }
+	if (_members->CountUsed() >= MEMBER_MAX_COUNT) {
+		return false;
+	}
     if(belongs_to_static_table) {
         SQInteger mmidx;
         if((sq_type(val) == OT_CLOSURE || sq_type(val) == OT_NATIVECLOSURE) &&
diff --git a/squirrel/sqclass.h b/squirrel/sqclass.h
index 7d40217..60d3d21 100644
--- a/squirrel/sqclass.h
+++ b/squirrel/sqclass.h
@@ -17,6 +17,7 @@ typedef sqvector<SQClassMember> SQClassMemberVec;
 
 #define MEMBER_TYPE_METHOD 0x01000000
 #define MEMBER_TYPE_FIELD 0x02000000
+#define MEMBER_MAX_COUNT 0x00FFFFFF
 
 #define _ismethod(o) (_integer(o)&MEMBER_TYPE_METHOD)
 #define _isfield(o) (_integer(o)&MEMBER_TYPE_FIELD)