diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
index b4b84e3e0949..2cf7fe131ece 100644
--- a/drivers/s390/char/sclp.c
+++ b/drivers/s390/char/sclp.c
@@ -28,7 +28,7 @@
 #define SCLP_HEADER		"sclp: "
 
 struct sclp_trace_entry {
-	char id[4];
+	char id[4] __nonstring;
 	u32 a;
 	u64 b;
 };