diff --git a/src/objective-c/GRPCClient/GRPCCallOptions.m b/src/objective-c/GRPCClient/GRPCCallOptions.m
index f9706b18467..c700bba794a 100644
--- a/src/objective-c/GRPCClient/GRPCCallOptions.m
+++ b/src/objective-c/GRPCClient/GRPCCallOptions.m
@@ -187,7 +187,7 @@ static NSUInteger kDefaultChannelID = 0;
                                                   connectMinTimeout:_connectMinTimeout
                                               connectInitialBackoff:_connectInitialBackoff
                                                   connectMaxBackoff:_connectMaxBackoff
-                                              additionalChannelArgs:[_additionalChannelArgs copy]
+                                              additionalChannelArgs:_additionalChannelArgs
                                                  PEMRootCertificates:_PEMRootCertificates
                                                       PEMPrivateKey:_PEMPrivateKey
                                                        PEMCertChain:_PEMCertChain