diff --git a/src/w32.c b/src/w32.c
index 195a322c503..734d6276e8f 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -583,6 +583,9 @@ w32_get_resource (key, lpdwtype)
   return (NULL);
 }
 
+char *get_emacs_configuration (void);
+extern Lisp_Object Vsystem_configuration;
+
 void
 init_environment ()
 {
@@ -633,6 +636,9 @@ init_environment ()
       }
   }
 
+  /* Rebuild system configuration to reflect invoking system.  */
+  Vsystem_configuration = build_string (EMACS_CONFIGURATION);
+
   init_user_info ();
 }