diff --git a/src/vim.h b/src/vim.h
index 4e0f2cd..8d0f3e0 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2254,6 +2254,7 @@
     ASSERT_NOTEQUAL,
     ASSERT_MATCH,
     ASSERT_NOTMATCH,
+    ASSERT_FAILS,
     ASSERT_OTHER
 } assert_type_T;