diff --git a/src/darwin/CHIPTool/CHIPTool/Framework Helpers/FabricKeys.m b/src/darwin/CHIPTool/CHIPTool/Framework Helpers/FabricKeys.m
index b7ff690604fe6c..55f6655b053b63 100644
--- a/src/darwin/CHIPTool/CHIPTool/Framework Helpers/FabricKeys.m	
+++ b/src/darwin/CHIPTool/CHIPTool/Framework Helpers/FabricKeys.m	
@@ -110,7 +110,7 @@ + (NSDictionary *)privateKeyCreationParams
 
     return @{
         (__bridge NSString *) kSecAttrKeyClass : (__bridge NSString *) kSecAttrKeyClassPrivate,
-        (__bridge NSString *) kSecAttrKeyType : (__bridge NSNumber *) kSecAttrKeyTypeECSECPrimeRandom,
+        (__bridge NSString *) kSecAttrKeyType : (__bridge NSString *) kSecAttrKeyTypeECSECPrimeRandom,
         (__bridge NSString *) kSecAttrKeySizeInBits : @(keySizeInBits),
         (__bridge NSString *) kSecAttrIsPermanent : @(NO)
     };