diff --git a/src/Module.zig b/src/Module.zig
index 4ddce3365595e2d63748a874ce78e485cdb52ebf..48c2eb8d0d8a300a5ee9f1db99a214d434cf87c3 100644
--- a/src/Module.zig
+++ b/src/Module.zig
@@ -2123,6 +2123,7 @@ pub fn deinit(mod: *Module) void {
     mod.global_error_set.deinit(gpa);
 
     mod.error_name_list.deinit(gpa);
+    mod.test_functions.deinit(gpa);
 }
 
 fn freeExportList(gpa: *Allocator, export_list: []*Export) void {