diff --git a/cc-ci-plan/launch.sh b/cc-ci-plan/launch.sh
index 2cd14ca..0957b6a 100755
--- a/cc-ci-plan/launch.sh
+++ b/cc-ci-plan/launch.sh
@@ -23,6 +23,10 @@
 
 set -euo pipefail
 
+# Absolute path to this script, so the watchdog re-invokes it correctly regardless of how it
+# was called or what cwd the tmux session uses (a relative $0 breaks once we cd into PLAN_DIR).
+SELF="$(readlink -f "${BASH_SOURCE[0]}")"
+
 # ----- config -------------------------------------------------------------
 PLAN_DIR="${PLAN_DIR:-/srv/cc-ci/cc-ci-plan}"
 CLAUDE_BIN="${CLAUDE_BIN:-claude}"
@@ -181,7 +185,7 @@ start_watchdog() {
   fi
   log "starting watchdog"
   tmux new-session -d -s "$WATCHDOG_SESSION" -c "$PLAN_DIR" \
-    "exec >>'$LOG_DIR/watchdog.log' 2>&1; '$0' watchdog"
+    "exec >>'$LOG_DIR/watchdog.log' 2>&1; '$SELF' watchdog"
 }
 
 stop_loops() {