diff --git a/scst/include/scst.h b/scst/include/scst.h
index a129a1434..d94c6e4bb 100644
--- a/scst/include/scst.h
+++ b/scst/include/scst.h
@@ -2548,7 +2548,7 @@ struct scst_proc_log {
 int scst_proc_log_entry_read(struct seq_file *seq, unsigned long log_level,
 	const struct scst_proc_log *tbl);
 
-int scst_proc_log_entry_write(struct file *file, const char *buf,
+int scst_proc_log_entry_write(struct file *file, const char __user *buf,
 	unsigned long length, unsigned long *log_level,
 	unsigned long default_level, const struct scst_proc_log *tbl);
 
diff --git a/scst/src/scst_proc.c b/scst/src/scst_proc.c
index 2ce18964f..076b901f4 100644
--- a/scst/src/scst_proc.c
+++ b/scst/src/scst_proc.c
@@ -206,7 +206,7 @@ static int strncasecmp(const char *s1, const char *s2, size_t n)
 
 static DEFINE_MUTEX(scst_log_mutex);
 
-int scst_proc_log_entry_write(struct file *file, const char *buf,
+int scst_proc_log_entry_write(struct file *file, const char __user *buf,
 	unsigned long length, unsigned long *log_level,
 	unsigned long default_level, const struct scst_proc_log *tbl)
 {