diff --git a/doc/docgen.zig b/doc/docgen.zig
index 128314696e..cc4993d65f 100644
--- a/doc/docgen.zig
+++ b/doc/docgen.zig
@@ -673,6 +673,7 @@ const TermState = enum {
 test "term color" {
     const input_bytes = "A\x1b[32;1mgreen\x1b[0mB";
     const result = try termColor(std.testing.leak_count_allocator, input_bytes);
+    defer std.testing.leak_count_allocator.free(result);
     testing.expectEqualSlices(u8, "A<span class=\"t32\">green</span>B", result);
 }