diff --git a/openbox/prop.c b/openbox/prop.c
index 5dc4a2fa..ec1ce3db 100644
--- a/openbox/prop.c
+++ b/openbox/prop.c
@@ -53,6 +53,7 @@ void prop_startup(void)
     CREATE(wm_client_leader, "WM_CLIENT_LEADER");
     CREATE(wm_transient_for, "WM_TRANSIENT_FOR");
     CREATE(motif_wm_hints, "_MOTIF_WM_HINTS");
+    CREATE(motif_wm_info, "_MOTIF_WM_INFO");
 
     CREATE(sm_client_id, "SM_CLIENT_ID");
 
diff --git a/openbox/prop.h b/openbox/prop.h
index 46c93017..644717a2 100644
--- a/openbox/prop.h
+++ b/openbox/prop.h
@@ -55,6 +55,7 @@ typedef struct Atoms {
     Atom wm_client_leader;
     Atom wm_transient_for;
     Atom motif_wm_hints;
+    Atom motif_wm_info;
 
     /* SM atoms */
     Atom sm_client_id;