diff -Naur wmbattery-2.56.orig/sonypi.c wmbattery-2.56/sonypi.c
--- wmbattery-2.56.orig/sonypi.c	2022-06-03 21:22:12.000000000 +0200
+++ wmbattery-2.56/sonypi.c	2025-08-22 01:21:59.483780914 +0200
@@ -24,7 +24,7 @@
 		return 1;
 }
 
-inline int sonypi_ioctl(int ioctlno, void *param)
+static int sonypi_ioctl(int ioctlno, void *param)
 {
 	if (ioctl(spicfd, ioctlno, param) < 0)
 		return 0;