diff --git a/backend/genesys_gl847.c b/backend/genesys_gl847.c
index fd65e527c..102fdc8a1 100644
--- a/backend/genesys_gl847.c
+++ b/backend/genesys_gl847.c
@@ -657,7 +657,7 @@ gl847_set_ad_fe (Genesys_Device * dev, uint8_t set)
 
   /* wait for FE to be ready */
   status = sanei_genesys_get_status (dev, &val8);
-  while (val8 & REG41_FEBUSY);
+  while (val8 & REG41_FEBUSY)
     {
       usleep (10000);
       status = sanei_genesys_get_status (dev, &val8);