diff --git a/lib/includes/nghttp2/nghttp2.h b/lib/includes/nghttp2/nghttp2.h
index ef4ed194..90ced0f2 100644
--- a/lib/includes/nghttp2/nghttp2.h
+++ b/lib/includes/nghttp2/nghttp2.h
@@ -201,7 +201,7 @@ typedef enum {
    */
   NGHTTP2_ERR_INVALID_ARGUMENT = -501,
   /**
-   * Ouf of buffer space.
+   * Out of buffer space.
    */
   NGHTTP2_ERR_BUFFER_ERROR = -502,
   /**