diff --git a/.zshrc b/.zshrc
index f413f7b..3cb37dc 100644
--- a/.zshrc
+++ b/.zshrc
@@ -67,7 +67,7 @@ alias senv="source .env/bin/activate"
 if [ -z "$SSH_AUTH_SOCK" ]
 then
    # Check for a currently running instance of the agent
-   RUNNING_AGENT="`ps -ax | grep 'ssh-agent -s' | grep -v grep | wc -l | tr -d '[:space:]'`"
+   RUNNING_AGENT="`ps -x | grep 'ssh-agent -s' | grep -v grep | wc -l | tr -d '[:space:]'`"
    if [ "$RUNNING_AGENT" = "0" ]
    then
         # Launch a new instance of the agent