diff --git a/net/http/header.ha b/net/http/header.ha
index c96226f..431be64 100644
--- a/net/http/header.ha
+++ b/net/http/header.ha
@@ -11,7 +11,7 @@ export type header = [](str, str);
 // Adds a given HTTP header, which may be added more than once. The name should
 // be canonicalized by the caller.
 export fn header_add(head: *header, name: str, val: str) void = {
-	assert(len(name) > 1 && len(val) > 1);
+	assert(len(name) >= 1 && len(val) >= 1);
 	append(head, (strings::dup(name), strings::dup(val)));
 };