diff --git a/packages/gatsby-remark-embed-snippet/src/index.js b/packages/gatsby-remark-embed-snippet/src/index.js
index ac05f53fbdfe0..ec4b76b4803e0 100644
--- a/packages/gatsby-remark-embed-snippet/src/index.js
+++ b/packages/gatsby-remark-embed-snippet/src/index.js
@@ -20,6 +20,7 @@ const FILE_EXTENSION_TO_LANGUAGE_MAP = {
   bat: `batch`,
   h: `c`,
   tex: `latex`,
+  csproj: `xml`,
 }
 
 const getLanguage = file => {