diff --git a/exercises/088_async5.zig b/exercises/088_async5.zig
index 523fa73..759a920 100644
--- a/exercises/088_async5.zig
+++ b/exercises/088_async5.zig
@@ -43,5 +43,6 @@ pub fn main() void {
 
 fn getPageTitle(url: []const u8) []const u8 {
     // Please PRETEND this is actually making a network request.
+    _ = url;
     return "Example Title.";
 }
diff --git a/exercises/089_async6.zig b/exercises/089_async6.zig
index d1681f7..755b438 100644
--- a/exercises/089_async6.zig
+++ b/exercises/089_async6.zig
@@ -49,5 +49,6 @@ pub fn main() void {
 
 fn getPageTitle(url: []const u8) []const u8 {
     // Please PRETEND this is actually making a network request.
+    _ = url;
     return "Example Title";
 }