diff --git a/types/mermaid/mermaidAPI.d.ts b/types/mermaid/mermaidAPI.d.ts
index 127a679dae..f90fe81574 100644
--- a/types/mermaid/mermaidAPI.d.ts
+++ b/types/mermaid/mermaidAPI.d.ts
@@ -1,5 +1,5 @@
 declare namespace mermaidAPI {
-    type Theme = "default" | "forest" | "dark" | "netural";
+    type Theme = "default" | "forest" | "dark" | "neutral";
 
     enum LogLevel {
         Debug = 1,