diff --git a/src/tests/tdb.t.cpp b/src/tests/tdb.t.cpp
index 329c4e143..da0c075e2 100644
--- a/src/tests/tdb.t.cpp
+++ b/src/tests/tdb.t.cpp
@@ -55,6 +55,9 @@ int main (int argc, char** argv)
     unlink ("./completed.data");
     unlink ("./undo.data");
 
+    // Set the context to allow GC.
+    context.config.set ("gc", "on");
+
     // Try reading an empty database.
     Filter filter;
     std::vector <Task> all;