diff --git a/libs/freetdm/src/isdn/Q921.c b/libs/freetdm/src/isdn/Q921.c
index 2a7ed18604..65e0d06fa0 100644
--- a/libs/freetdm/src/isdn/Q921.c
+++ b/libs/freetdm/src/isdn/Q921.c
@@ -50,7 +50,10 @@
 /*****************************************************************************
   Global Tables & Variables.
 *****************************************************************************/
+#ifdef Q921_HANDLE_STATIC 
 Q921Data Q921DevSpace[Q921MAXTRUNK];
+#endif
+
 int Q921HeaderSpace={0};
 
 int (*Q921Tx21Proc)(L2TRUNK dev, L2UCHAR *, int)={NULL};