diff --git a/include/webassets.hpp b/include/webassets.hpp
index a4ec58b..97a0194 100644
--- a/include/webassets.hpp
+++ b/include/webassets.hpp
@@ -45,7 +45,6 @@
              {".json", "application/json"},
              {".jpg", "image/jpeg"},
              {".jpeg", "image/jpeg"},
-             {".json", "application/json"},
              // dev tools don't care about map type, setting to json causes
              // browser to show as text
              // https://stackoverflow.com/questions/19911929/what-mime-type-should-i-use-for-javascript-source-map-files