diff --git a/dist/index.js b/dist/index.js
index 01174fa..c7cd19e 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -62228,7 +62228,7 @@ function prepareDestinations(registries, tags) {
   const destinations = [];
   registries.forEach((registry) => {
     tags.forEach((tag) => {
-      destinations.push(registry + tag);
+      destinations.push(registry + ':' + tag);
     });
   });
 
diff --git a/src/lib.js b/src/lib.js
index 474cfc7..cf3f45c 100644
--- a/src/lib.js
+++ b/src/lib.js
@@ -128,7 +128,7 @@ export function prepareDestinations(registries, tags) {
   const destinations = [];
   registries.forEach((registry) => {
     tags.forEach((tag) => {
-      destinations.push(registry + tag);
+      destinations.push(registry + ':' + tag);
     });
   });