diff --git a/drivers/isdn/mISDN/dsp_cmx.c b/drivers/isdn/mISDN/dsp_cmx.c
index 334feab060a1..b7589c2eecf5 100644
--- a/drivers/isdn/mISDN/dsp_cmx.c
+++ b/drivers/isdn/mISDN/dsp_cmx.c
@@ -1328,7 +1328,7 @@ dsp_cmx_send_member(struct dsp *dsp, int len, s32 *c, int members)
 		}
 		if (dsp->conf && dsp->conf->software && dsp->conf->hardware)
 			tx_data_only = 1;
-		if (dsp->conf->software && dsp->echo.hardware)
+		if (dsp->echo.software && dsp->echo.hardware)
 			tx_data_only = 1;
 	}