1 files changed, 1 insertions, 0 deletions
diff --git a/src/nvim/spell.c b/src/nvim/spell.c
index f6dc3a04a7..d1428b0117 100644
--- a/src/nvim/spell.c
+++ b/src/nvim/spell.c
@@ -1677,6 +1677,7 @@ static void int_wordlist_spl(char_u *fname)
 // Allocate a new slang_T for language "lang".  "lang" can be NULL.
 // Caller must fill "sl_next".
 slang_T *slang_alloc(char_u *lang)
+  FUNC_ATTR_NONNULL_RET
 {
   slang_T *lp = xcalloc(1, sizeof(slang_T));