diff --git a/examples/chip-tool/gen/CHIPClustersObjc.mm b/examples/chip-tool/gen/CHIPClustersObjc.mm
index e6f2c8eae4cfa8..dc439dadcc29c8 100644
--- a/examples/chip-tool/gen/CHIPClustersObjc.mm
+++ b/examples/chip-tool/gen/CHIPClustersObjc.mm
@@ -104,16 +104,15 @@ static void CallbackFn(void * context, uint8_t status)
 
     static void CallbackFn(void * context, chip::ByteSpan value)
     {
+        NSData * data = [NSData dataWithBytes:value.data() length:value.size()];
+
         CHIPStringAttributeCallbackBridge * callback = reinterpret_cast<CHIPStringAttributeCallbackBridge *>(context);
         if (callback && callback->mQueue) {
             dispatch_async(callback->mQueue, ^{
                 if (callback->mOctetString) {
-                    NSData * data = [NSData dataWithBytes:value.data() length:value.size()];
                     callback->mHandler(nil, @ { @"value" : data });
                 } else {
-                    NSString * str = [[NSString alloc] initWithBytes:value.data()
-                                                              length:value.size()
-                                                            encoding:NSUTF8StringEncoding];
+                    NSString * str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                     callback->mHandler(nil, @ { @"value" : str });
                 }
 
diff --git a/src/app/zap-templates/templates/app/CHIPClustersObjc-src.zapt b/src/app/zap-templates/templates/app/CHIPClustersObjc-src.zapt
index 82bb71680a5718..52de41c0548053 100644
--- a/src/app/zap-templates/templates/app/CHIPClustersObjc-src.zapt
+++ b/src/app/zap-templates/templates/app/CHIPClustersObjc-src.zapt
@@ -88,17 +88,18 @@ public:
 
     static void CallbackFn(void * context, chip::ByteSpan value)
     {
+        NSData * data = [NSData dataWithBytes: value.data() length: value.size()];
+
         CHIPStringAttributeCallbackBridge * callback = reinterpret_cast<CHIPStringAttributeCallbackBridge *>(context);
         if (callback && callback->mQueue) {
             dispatch_async(callback->mQueue, ^{
                 if (callback->mOctetString)
                 {
-                    NSData *data = [NSData dataWithBytes: value.data() length: value.size()];
                     callback->mHandler(nil, @{ @"value": data });
                 }
                 else
                 {
-                    NSString * str = [[NSString alloc] initWithBytes:value.data() length:value.size() encoding:NSUTF8StringEncoding];
+                    NSString * str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                     callback->mHandler(nil, @{ @"value": str });
                 }
 
diff --git a/src/controller/python/gen/CHIPClustersObjc.mm b/src/controller/python/gen/CHIPClustersObjc.mm
index 4eb235e195872e..b9125119350285 100644
--- a/src/controller/python/gen/CHIPClustersObjc.mm
+++ b/src/controller/python/gen/CHIPClustersObjc.mm
@@ -104,16 +104,15 @@ static void CallbackFn(void * context, uint8_t status)
 
     static void CallbackFn(void * context, chip::ByteSpan value)
     {
+        NSData * data = [NSData dataWithBytes:value.data() length:value.size()];
+
         CHIPStringAttributeCallbackBridge * callback = reinterpret_cast<CHIPStringAttributeCallbackBridge *>(context);
         if (callback && callback->mQueue) {
             dispatch_async(callback->mQueue, ^{
                 if (callback->mOctetString) {
-                    NSData * data = [NSData dataWithBytes:value.data() length:value.size()];
                     callback->mHandler(nil, @ { @"value" : data });
                 } else {
-                    NSString * str = [[NSString alloc] initWithBytes:value.data()
-                                                              length:value.size()
-                                                            encoding:NSUTF8StringEncoding];
+                    NSString * str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                     callback->mHandler(nil, @ { @"value" : str });
                 }
 
diff --git a/src/darwin/Framework/CHIP/gen/CHIPClustersObjc.mm b/src/darwin/Framework/CHIP/gen/CHIPClustersObjc.mm
index 1c21cbcf9485d8..29e4339c74cd60 100644
--- a/src/darwin/Framework/CHIP/gen/CHIPClustersObjc.mm
+++ b/src/darwin/Framework/CHIP/gen/CHIPClustersObjc.mm
@@ -104,16 +104,15 @@ static void CallbackFn(void * context, uint8_t status)
 
     static void CallbackFn(void * context, chip::ByteSpan value)
     {
+        NSData * data = [NSData dataWithBytes:value.data() length:value.size()];
+
         CHIPStringAttributeCallbackBridge * callback = reinterpret_cast<CHIPStringAttributeCallbackBridge *>(context);
         if (callback && callback->mQueue) {
             dispatch_async(callback->mQueue, ^{
                 if (callback->mOctetString) {
-                    NSData * data = [NSData dataWithBytes:value.data() length:value.size()];
                     callback->mHandler(nil, @ { @"value" : data });
                 } else {
-                    NSString * str = [[NSString alloc] initWithBytes:value.data()
-                                                              length:value.size()
-                                                            encoding:NSUTF8StringEncoding];
+                    NSString * str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                     callback->mHandler(nil, @ { @"value" : str });
                 }