diff --git a/scripts/sync-compat.sh b/scripts/sync-compat.sh
index 0c2d4ba5004..116725cb338 100755
--- a/scripts/sync-compat.sh
+++ b/scripts/sync-compat.sh
@@ -33,7 +33,7 @@ for arg in "$@"; do
 done
 
 # Extract DefaultCopilotVersion from Go constants file
-COPILOT_VERSION=$(grep -oP '^\s*const DefaultCopilotVersion\s+Version\s*=\s*"\K[^"]+' "$CONSTANTS_FILE")
+COPILOT_VERSION=$(grep -E '^\s*const DefaultCopilotVersion' "$CONSTANTS_FILE" | sed -E 's/.*"([^"]+)".*/\1/')
 if [ -z "$COPILOT_VERSION" ]; then
   echo "Error: could not extract DefaultCopilotVersion from $CONSTANTS_FILE" >&2
   exit 1