diff --git a/vinca/templates/activate.sh.in b/vinca/templates/activate.sh.in
index 4a35f58..aece970 100644
--- a/vinca/templates/activate.sh.in
+++ b/vinca/templates/activate.sh.in
@@ -15,7 +15,7 @@ else
 fi
 
 case "$OSTYPE" in
-  darwin*)  export ROS_OS_OVERRIDE="conda:osx";;
+  darwin*)  export ROS_OS_OVERRIDE="conda:osx"; export RMW_IMPLEMENTATION="rmw_cyclonedds_cpp";;
   linux*)   export ROS_OS_OVERRIDE="conda:linux";;
 esac
 
diff --git a/vinca/templates/deactivate.sh.in b/vinca/templates/deactivate.sh.in
index 98957c6..87d4d83 100644
--- a/vinca/templates/deactivate.sh.in
+++ b/vinca/templates/deactivate.sh.in
@@ -18,3 +18,4 @@ unset ROS_OS_OVERRIDE
 # unset QT_PLUGIN_PATH
 unset ROS_LOCALHOST_ONLY
 unset ament_python_executable
+unset RMW_IMPLEMENTATION