diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3d7831b2a4..711ac14c4c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -211,6 +211,9 @@ if(DEFINED WITH_OTLP)
   )
 endif()
 
+option(WITH_OTLP_GRPC_SSL_MTLS_PREVIEW
+       "Whether to enable mTLS support fro gRPC" OFF)
+
 option(WITH_OTLP_GRPC "Whether to include the OTLP gRPC exporter in the SDK"
        OFF)