diff --git a/lib/GR/ExplodedGraph.cpp b/lib/GR/ExplodedGraph.cpp
index 6890ebf..fc46813 100644
--- a/lib/GR/ExplodedGraph.cpp
+++ b/lib/GR/ExplodedGraph.cpp
@@ -21,6 +21,7 @@
 #include <vector>
 
 using namespace clang;
+using namespace GR;
 
 //===----------------------------------------------------------------------===//
 // Node auditing.