diff --git a/x11-plugins/wmbattery/files/wmbattery-2.56-lto.patch b/x11-plugins/wmbattery/files/wmbattery-2.56-lto.patch
new file mode 100644
index 000000000000..cf7d21a41e02
--- /dev/null
+++ b/x11-plugins/wmbattery/files/wmbattery-2.56-lto.patch
@@ -0,0 +1,12 @@
+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;
diff --git a/x11-plugins/wmbattery/wmbattery-2.56.ebuild b/x11-plugins/wmbattery/wmbattery-2.56.ebuild
index e9589452647d..1af304ee34c8 100644
--- a/x11-plugins/wmbattery/wmbattery-2.56.ebuild
+++ b/x11-plugins/wmbattery/wmbattery-2.56.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -20,6 +20,7 @@ RDEPEND="apm? ( sys-apps/apmd )
 DEPEND="${RDEPEND}"
 BDEPEND="virtual/pkgconfig"
 
+PATCHES=( "${FILESDIR}"/${P}-lto.patch )
 DOCS=( ChangeLog README TODO )
 
 src_configure() {