diff --git a/libc/netbsd/resolv/res_cache.c b/libc/netbsd/resolv/res_cache.c
index 2c912de..2621a7b 100644
--- a/libc/netbsd/resolv/res_cache.c
+++ b/libc/netbsd/resolv/res_cache.c
@@ -251,7 +251,7 @@
         return p;
 
     va_start(args, format);
-    n = snprintf( p, avail, format, args);
+    n = vsnprintf( p, avail, format, args);
     va_end(args);
 
     /* certain C libraries return -1 in case of truncation */