diff --git a/include/boost/config/compiler/common_edg.hpp b/include/boost/config/compiler/common_edg.hpp
index a83ab677..e0e3fd3b 100644
--- a/include/boost/config/compiler/common_edg.hpp
+++ b/include/boost/config/compiler/common_edg.hpp
@@ -22,4 +22,8 @@
 #   define BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP
 #endif
 
+#ifdef c_plusplus
+// EDG has "long long" in non-strict mode
+#define BOOST_HAS_LONG_LONG
+#endif