diff --git a/src/console/vtxprintf.c b/src/console/vtxprintf.c
index d20a387d44..5f37253e7d 100644
--- a/src/console/vtxprintf.c
+++ b/src/console/vtxprintf.c
@@ -228,7 +228,7 @@ repeat:
 			if (!s)
 				s = "<NULL>";
 
-			len = strnlen(s, precision);
+			len = strnlen(s, (size_t)precision);
 
 			if (!(flags & LEFT))
 				while (len < field_width--)