diff --git a/.gitea/workflows/build.yaml b/.gitea/workflows/build.yaml
index ab7b9d4..5f49c4d 100644
--- a/.gitea/workflows/build.yaml
+++ b/.gitea/workflows/build.yaml
@@ -25,8 +25,12 @@ jobs:
           # Extract repository name without owner
           REPO_NAME_ONLY=$(echo "$REPO_NAME" | cut -d'/' -f2)
 
+          # Convert to lowercase for Docker registry compatibility
+          REPO_OWNER_LOWER=$(echo "$REPO_OWNER" | tr '[:upper:]' '[:lower:]')
+          REPO_NAME_LOWER=$(echo "$REPO_NAME_ONLY" | tr '[:upper:]' '[:lower:]')
+
           # Base image path
-          IMAGE_BASE="${REGISTRY}/${REPO_OWNER}/${REPO_NAME_ONLY}"
+          IMAGE_BASE="${REGISTRY}/${REPO_OWNER_LOWER}/${REPO_NAME_LOWER}"
 
           # Determine tag based on ref
           if [[ "${{ gitea.ref }}" == refs/tags/* ]]; then