Fix mistake

1 files changed, 1 insertions, 1 deletions

diff --git a/src/main.c b/src/main.c
index c380dda..a6983e5 100644
--- a/src/main.c
+++ b/src/main.c
@@ -161,7 +161,7 @@ static void __strbuild(char *buf, int size,
 	len = vsnprintf(buf, size, fmt, ap);
 	va_end(ap);
 
-	assert(n >= 0);
+	assert(len >= 0);
 }
 
 /* Convenience wrapper for __strbuild. */