diff --git a/build.zig b/build.zig
index ce64b2f..5cfee8e 100644
--- a/build.zig
+++ b/build.zig
@@ -36,6 +36,7 @@ pub fn build(builder: *std.build.Builder) void {
     {
         const tests = builder.addTestExe("test", "./src/tests.zig");
 
+        tests.addPackage(core_pkg);
         tests.setTarget(target);
         tests.setBuildMode(mode);
         builder.step("test", "Run unit tests").dependOn(&tests.step);