diff --git a/registry/coder/modules/claude-code/scripts/start.sh b/registry/coder/modules/claude-code/scripts/start.sh
index e88ea994..dac70e3f 100644
--- a/registry/coder/modules/claude-code/scripts/start.sh
+++ b/registry/coder/modules/claude-code/scripts/start.sh
@@ -6,7 +6,7 @@ set -euo pipefail
 true > "$HOME/start.log"
 
 log() {
-    printf "$@" >> "$HOME/start.log"
+    printf -- "$@" >> "$HOME/start.log"
 }
 
 command_exists() {