diff --git a/common/src/arch-x86.C b/common/src/arch-x86.C
index 214407b735..d69d69a5ad 100644
--- a/common/src/arch-x86.C
+++ b/common/src/arch-x86.C
@@ -158,6 +158,7 @@
 
 using namespace std;
 using namespace boost::assign;
+using namespace Dyninst;
 
 namespace NS_x86 {