diff --git a/docs/building-GTK.md b/docs/building-GTK.md
index 4ac0fc89e..9b5948875 100644
--- a/docs/building-GTK.md
+++ b/docs/building-GTK.md
@@ -50,7 +50,7 @@
   they are invalid.  But as this is currently unimplemented in the GTK
   flavour of NetSurf, this won't make a difference at all.
 
-  For experimental javascript support the mozilla spiermonkey library
+  For experimental javascript support the mozilla spidermonkey library
   is required:
 
       $ apt-get install libmozjs-dev