diff --git a/.woodpecker.yml b/.woodpecker.yml
index c18a819..594ce86 100644
--- a/.woodpecker.yml
+++ b/.woodpecker.yml
@@ -5,6 +5,6 @@ matrix:
 
 steps:
   example:
-    image: deblan/php:$PHP_VERSION
+    image: deblan/php:${PHP_VERSION}
     commands:
       - php -v