diff --git a/action.yml b/action.yml
index 0b8c522..119b867 100644
--- a/action.yml
+++ b/action.yml
@@ -238,10 +238,10 @@ runs:
         if [[ "$INPUT_SQUASH_LAYERS" == "true" ]]; then
           DOCKER_ARGS="$DOCKER_ARGS --squash"
         fi
-        if [[ -z "$IMAGE_DESTS" ]]; then
+        if [[ ! -z "$IMAGE_DESTS" ]]; then
           DOCKER_ARGS="$DOCKER_ARGS $IMAGE_DESTS"
         fi
-        if [[ -z "$INPUT_ADDITIONAL_REGISTRY_DESTINATIONS" ]]; then
+        if [[ ! -z "$INPUT_ADDITIONAL_REGISTRY_DESTINATIONS" ]]; then
           DOCKER_ARGS="$DOCKER_ARGS $INPUT_ADDITIONAL_REGISTRY_DESTINATIONS"
         fi