diff --git a/tests/tests.cpp b/tests/tests.cpp
index 14d2a9d2..0aa0f695 100644
--- a/tests/tests.cpp
+++ b/tests/tests.cpp
@@ -128,7 +128,7 @@ test_config_branches()
   Branches::Ptr bcp0;
   Branches::Ptr bcp1;
 
-  minfreespace = 1234;
+  b.minfreespace = 1234;
   TEST_CHECK(b->minfreespace() == 1234);
   TEST_CHECK(b.to_string() == "");