diff --git a/Eigen/src/Core/util/StaticAssert.h b/Eigen/src/Core/util/StaticAssert.h
index fbaf676de..79174a51d 100644
--- a/Eigen/src/Core/util/StaticAssert.h
+++ b/Eigen/src/Core/util/StaticAssert.h
@@ -74,7 +74,7 @@
     };
 
     #define EIGEN_STATIC_ASSERT(CONDITION,MSG) \
-      if (ei_static_assert<CONDITION ? true : false>::MSG) {}
+      if (Eigen::ei_static_assert<CONDITION ? true : false>::MSG) {}
 
   #endif // CXX0X