diff --git a/test/test_environment.py b/test/test_environment.py
index dd2de0ea..7de1c0bf 100644
--- a/test/test_environment.py
+++ b/test/test_environment.py
@@ -13,12 +13,15 @@ project_with_environment_asserts = test_projects.new_c_project(
         # explode if environment isn't correct, as set in CIBW_ENVIRONMENT
         CIBW_TEST_VAR = os.environ.get("CIBW_TEST_VAR")
         CIBW_TEST_VAR_2 = os.environ.get("CIBW_TEST_VAR_2")
+        CIBW_TEST_VAR_3 = os.environ.get("CIBW_TEST_VAR_3")
         PATH = os.environ.get("PATH")
 
         if CIBW_TEST_VAR != "a b c":
             raise Exception('CIBW_TEST_VAR should equal "a b c". It was "%s"' % CIBW_TEST_VAR)
         if CIBW_TEST_VAR_2 != "1":
             raise Exception('CIBW_TEST_VAR_2 should equal "1". It was "%s"' % CIBW_TEST_VAR_2)
+        if CIBW_TEST_VAR_3 != "test string 3":
+            raise Exception('CIBW_TEST_VAR_3 should equal "test string 3". It was "%s"' % CIBW_TEST_VAR_3)
         if "/opt/cibw_test_path" not in PATH:
             raise Exception('PATH should contain "/opt/cibw_test_path". It was "%s"' % PATH)
         if "$PATH" in PATH: