diff --git a/drivers/char/adsprpc.c b/drivers/char/adsprpc.c
index 014bd8842cd2..7df66932cba6 100644
--- a/drivers/char/adsprpc.c
+++ b/drivers/char/adsprpc.c
@@ -2948,7 +2948,7 @@ static int fastrpc_device_open(struct inode *inode, struct file *filp)
 	if (err)
 		return err;
 	snprintf(strpid, PID_SIZE, "%d", current->pid);
-	buf_size = strlen(current->comm) + strlen(strpid) + 1;
+	buf_size = strlen(current->comm) + strlen("_") + strlen(strpid) + 1;
 	fl->debug_buf = kzalloc(buf_size, GFP_KERNEL);
 	snprintf(fl->debug_buf, UL_SIZE, "%.10s%s%d",
 	current->comm, "_", current->pid);