diff --git a/.bashrc b/.bashrc
index cad450f..ebf2e29 100644
--- a/.bashrc
+++ b/.bashrc
@@ -6,7 +6,7 @@ _agent_prompt_command() {
     # Check the ssh agent socket is still alive.
     # Need to work around an ssh-add bug here: ssh-add doesn't always return 2 on failure
     # to contact the agent, so also check if any errors were produced.
-    OUTPUT=$(ssh-add -l 2>&1 >/dev/null)
+    OUTPUT="$(ssh-add -l 2>&1 >/dev/null)"
     if ((${PIPESTATUS[0]} >= 2)) || [[ ! -z "$OUTPUT" ]]; then
       # Auth socket has become unusable, search for a new one.
       SOCK="$(_find_agent_sock)"