diff --git a/drivers/staging/comedi/drivers/addi-data/addi_amcc_s5933.h b/drivers/staging/comedi/drivers/addi-data/addi_amcc_s5933.h
index f96b1289cdfc..3682503e3412 100644
--- a/drivers/staging/comedi/drivers/addi-data/addi_amcc_s5933.h
+++ b/drivers/staging/comedi/drivers/addi-data/addi_amcc_s5933.h
@@ -212,7 +212,7 @@ struct pcilst_struct {
 };
 
 /* ptr to root list of all amcc devices */
-struct pcilst_struct *amcc_devices;
+static struct pcilst_struct *amcc_devices;
 
 static const int i_ADDIDATADeviceID[] = { 0x15B8, 0x10E8 };