1 files changed, 3 insertions, 0 deletions
diff --git a/src/diag.h b/src/diag.h
index 56ad39b..8d0b19f 100644
--- a/src/diag.h
+++ b/src/diag.h
@@ -58,16 +58,19 @@ bool bfs_debug(const struct bfs_ctx *ctx, enum debug_flags flag, const char *for
 /**
  * bfs_error() variant that takes a va_list.
  */
+BFS_FORMATTER(2, 0)
 void bfs_verror(const struct bfs_ctx *ctx, const char *format, va_list args);
 
 /**
  * bfs_warning() variant that takes a va_list.
  */
+BFS_FORMATTER(2, 0)
 bool bfs_vwarning(const struct bfs_ctx *ctx, const char *format, va_list args);
 
 /**
  * bfs_debug() variant that takes a va_list.
  */
+BFS_FORMATTER(3, 0)
 bool bfs_vdebug(const struct bfs_ctx *ctx, enum debug_flags flag, const char *format, va_list args);
 
 /**