diff --git a/tests/header_changed.hancho b/tests/header_changed.hancho
index 809a37a..ad9e1a6 100644
--- a/tests/header_changed.hancho
+++ b/tests/header_changed.hancho
@@ -1,4 +1,10 @@
 from hancho import *
 
-rules = load("rules.hancho")
+build_config.defaults(
+  command_path = Path.cwd(),
+  source_path  = Path.cwd(),
+  build_path   = Path.cwd() / "build",
+)
+
+rules = load("rules.hancho", build_config)
 rules.compile_cpp("src/test.cpp")
diff --git a/tests/run_tests.py b/tests/run_tests.py
index 575331b..c9805bf 100755
--- a/tests/run_tests.py
+++ b/tests/run_tests.py
@@ -197,20 +197,20 @@ def test_doesnt_create_output(self):
         run_hancho("doesnt_create_output")
         self.assertFalse(path.exists("build/result.txt"))
 
-#    def test_header_changed(self):
-#        """Changing a header file tracked in the GCC depfile should trigger a rebuild"""
-#        run_hancho("header_changed")
-#        mtime1 = mtime("build/src/test.o")
-#
-#        run_hancho("header_changed")
-#        mtime2 = mtime("build/src/test.o")
-#
-#        Path("src/test.hpp").touch()
-#        run_hancho("header_changed")
-#        mtime3 = mtime("build/src/test.o")
-#        self.assertEqual(mtime1, mtime2)
-#        self.assertLess(mtime2, mtime3)
-#
+    def test_header_changed(self):
+        """Changing a header file tracked in the GCC depfile should trigger a rebuild"""
+        run_hancho("header_changed")
+        mtime1 = mtime("build/src/test.o")
+
+        run_hancho("header_changed")
+        mtime2 = mtime("build/src/test.o")
+
+        Path("src/test.hpp").touch()
+        run_hancho("header_changed")
+        mtime3 = mtime("build/src/test.o")
+        self.assertEqual(mtime1, mtime2)
+        self.assertLess(mtime2, mtime3)
+
 #    def test_input_changed(self):
 #        """Changing a source file should trigger a rebuild"""
 #        run_hancho("input_changed")