diff --git a/skills/build-on-base/scripts/register.sh b/skills/build-on-base/scripts/register.sh
index 7c7ed55..33ac0f8 100755
--- a/skills/build-on-base/scripts/register.sh
+++ b/skills/build-on-base/scripts/register.sh
@@ -18,7 +18,7 @@ RESPONSE=$(curl -sf -X POST "$API_URL" \
   exit 1
 }
 
-BUILDER_CODE=$(echo "$RESPONSE" | grep -o '"builder_code":"[^"]*"' | cut -d'"' -f4)
+BUILDER_CODE=$(echo "$RESPONSE" | grep -o '"builder_code":[[:space:]]*"[^"]*"' | cut -d'"' -f4)
 
 if [ -z "$BUILDER_CODE" ]; then
   echo "Error: No builder_code in API response" >&2