diff --git a/pkg/photo/upload.go b/pkg/photo/upload.go
index 5b0f4de..348e131 100644
--- a/pkg/photo/upload.go
+++ b/pkg/photo/upload.go
@@ -35,8 +35,8 @@ type UploadConfig struct {
 // - error on errors
 func UploadPhoto(cfg UploadConfig) (string, string, error) {
 	// Validate and normalize the extension.
-	var extension = cfg.Extension
-	switch cfg.Extension {
+	var extension = strings.ToLower(cfg.Extension)
+	switch extension {
 	case ".jpg":
 		fallthrough
 	case ".jpe":