diff --git a/src/main.ts b/src/main.ts
index deb56ef..6b66c2e 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -33,7 +33,7 @@ actionsToolkit.run(
     });
 
     let toolPath;
-    if (Util.isValidUrl(inputs.version)) {
+    if (Util.isValidRef(inputs.version)) {
       if (standalone) {
         throw new Error(`Cannot build from source without the Docker CLI`);
       }