1 files changed, 1 insertions, 0 deletions
diff --git a/src/diag.c b/src/diag.c
index a9be5b4..80d988f 100644
--- a/src/diag.c
+++ b/src/diag.c
@@ -22,6 +22,7 @@
 #include <assert.h>
 #include <errno.h>
 #include <stdarg.h>
+#include <stddef.h>
 
 void bfs_perror(const struct bfs_ctx *ctx, const char *str) {
 	bfs_error(ctx, "%s: %m.\n", str);