diff --git a/lisp/ob-C.el b/lisp/ob-C.el
index 795bcb2b7..f2af5b3fb 100644
--- a/lisp/ob-C.el
+++ b/lisp/ob-C.el
@@ -278,12 +278,12 @@ its header arguments."
 (defun org-babel-prep-session:C (_session _params)
   "This function does nothing as C is a compiled language with no
 support for sessions"
-  (error "C is a compiled languages -- no support for sessions"))
+  (error "C is a compiled language -- no support for sessions"))
 
 (defun org-babel-load-session:C (_session _body _params)
   "This function does nothing as C is a compiled language with no
 support for sessions"
-  (error "C is a compiled languages -- no support for sessions"))
+  (error "C is a compiled language -- no support for sessions"))
 
 ;; helper functions