1 files changed, 1 insertions, 0 deletions
diff --git a/src/nvim/os/env.c b/src/nvim/os/env.c
index 669475fa72..f5dbf0694e 100644
--- a/src/nvim/os/env.c
+++ b/src/nvim/os/env.c
@@ -412,6 +412,7 @@ void expand_env_esc(char_u *restrict srcp,
                     bool esc,
                     bool one,
                     char_u *prefix)
+  FUNC_ATTR_NONNULL_ARG(1, 2)
 {
   char_u      *tail;
   char_u      *var;