diff --git a/relay/channel/gemini/relay-gemini.go b/relay/channel/gemini/relay-gemini.go
index f83709a5c..4d93027f0 100644
--- a/relay/channel/gemini/relay-gemini.go
+++ b/relay/channel/gemini/relay-gemini.go
@@ -32,6 +32,7 @@ var geminiSupportedMimeTypes = map[string]bool{
 	"audio/wav":       true,
 	"image/png":       true,
 	"image/jpeg":      true,
+	"image/jpg":       true, // support old image/jpeg
 	"image/webp":      true,
 	"text/plain":      true,
 	"video/mov":       true,