diff --git a/lib/wind/idn-lookup.c b/lib/wind/idn-lookup.c
index 45da15633..5b71a8fed 100644
--- a/lib/wind/idn-lookup.c
+++ b/lib/wind/idn-lookup.c
@@ -69,12 +69,17 @@ lookup(const char *name)
     struct addrinfo *ai;
 
     size_t u_len = strlen(name);
-    uint32_t *u = calloc(u_len, sizeof(uint32_t));
-    size_t norm_len = u_len * 2;
-    uint32_t *norm = calloc(norm_len, sizeof(uint32_t));
+    uint32_t *u;
+    size_t norm_len = u_len * 8;
+    uint32_t *norm;
 
+    if (u_len == 0)
+	return;
+
+    u = calloc(u_len, sizeof(uint32_t));
     if (u == NULL && u_len != 0)
 	errx(1, "malloc failed");
+    norm = calloc(norm_len, sizeof(uint32_t));
     if (norm == NULL && norm_len != 0)
 	errx(1, "malloc failed");
 
@@ -156,9 +161,7 @@ main(int argc, char **argv)
     if (argc == 0)
 	usage(1);
 
-    for (i = 0; i < argc; ++i) {
-        if (argv[i][0]) /* Quiet lint */
-            lookup(argv[i]);
-    }
+    for (i = 0; i < argc; ++i)
+	lookup(argv[i]);
     return 0;
 }