diff --git a/generate.ts b/generate.ts
index 69c032c5ca6e5f9b6882f04009dc4195c8af7d87..9e1172d1fae3544e47fddee21dcbb7ebc6f6344c 100644
--- a/generate.ts
+++ b/generate.ts
@@ -61,10 +61,11 @@ const E = stringEscape;
 w.write(`
 pub fn parseFail(input: []const u8, base: ?[]const u8) !void {
     const allocator = std.testing.allocator;
-    _ = url.URL.parse(allocator, input, base) catch |err| switch (err) {
+    const u = url.URL.parse(allocator, input, base) catch |err| switch (err) {
         error.InvalidURL => return,
         error.OutOfMemory => return error.OutOfMemory,
     };
+    defer allocator.free(u.href);
     return error.FailZigTest;
 }
 
@@ -87,10 +88,11 @@ pub fn parsePass(input: []const u8, base: ?[]const u8, href: []const u8, origin:
 
 pub fn parseIDNAFail(comptime input: []const u8) !void {
     const allocator = std.testing.allocator;
-    _ = url.URL.parse(allocator, "https://" ++ input ++ "/x", null) catch |err| switch (err) {
+    const u = url.URL.parse(allocator, "https://" ++ input ++ "/x", null) catch |err| switch (err) {
         error.InvalidURL => return,
         error.OutOfMemory => return error.OutOfMemory,
     };
+    defer allocator.free(u.href);
     return error.FailZigTest;
 }
 
diff --git a/zig-out/test.zig b/zig-out/test.zig
index e85facde221c8342a8b4eb65ef865e1f4092e64f..ab9c75de824e363b1f9b73c7f2076ba1c84816ed 100644
--- a/zig-out/test.zig
+++ b/zig-out/test.zig
@@ -6,10 +6,11 @@ const expect = @import("expect").expect;
 
 pub fn parseFail(input: []const u8, base: ?[]const u8) !void {
     const allocator = std.testing.allocator;
-    _ = url.URL.parse(allocator, input, base) catch |err| switch (err) {
+    const u = url.URL.parse(allocator, input, base) catch |err| switch (err) {
         error.InvalidURL => return,
         error.OutOfMemory => return error.OutOfMemory,
     };
+    defer allocator.free(u.href);
     return error.FailZigTest;
 }
 
@@ -32,10 +33,11 @@ pub fn parsePass(input: []const u8, base: ?[]const u8, href: []const u8, origin:
 
 pub fn parseIDNAFail(comptime input: []const u8) !void {
     const allocator = std.testing.allocator;
-    _ = url.URL.parse(allocator, "https://" ++ input ++ "/x", null) catch |err| switch (err) {
+    const u = url.URL.parse(allocator, "https://" ++ input ++ "/x", null) catch |err| switch (err) {
         error.InvalidURL => return,
         error.OutOfMemory => return error.OutOfMemory,
     };
+    defer allocator.free(u.href);
     return error.FailZigTest;
 }