diff --git a/src/services/note_types.ts b/src/services/note_types.ts
index 3e086acf4..a242fc7b2 100644
--- a/src/services/note_types.ts
+++ b/src/services/note_types.ts
@@ -8,7 +8,7 @@ const noteTypes = [
     { type: "relationMap", defaultMime: "application/json" },
     { type: "book", defaultMime: "" },
     { type: "noteMap", defaultMime: "" },
-    { type: "mermaid", defaultMime: "text/plain" },
+    { type: "mermaid", defaultMime: "text/vnd.mermaid" },
     { type: "canvas", defaultMime: "application/json" },
     { type: "webView", defaultMime: "" },
     { type: "launcher", defaultMime: "" },