diff --git a/ly-core/build.zig b/ly-core/build.zig
index f6574de..9400ff2 100644
--- a/ly-core/build.zig
+++ b/ly-core/build.zig
@@ -45,6 +45,7 @@ pub fn build(b: *std.Build) void {
     } else if (target.result.os.tag == .freebsd) {
         addCImport(b, mod, translate_c, target, optimize, "kbio", "#include <sys/kbio.h>");
         addCImport(b, mod, translate_c, target, optimize, "consio", "#include <sys/consio.h>");
+        addCImport(b, mod, translate_c, target, optimize, "sysctl", "#include <sys/sysctl.h>");
     }
 
     const mod_tests = b.addTest(.{
diff --git a/ly-core/src/interop.zig b/ly-core/src/interop.zig
index f23583c..9b16c62 100644
--- a/ly-core/src/interop.zig
+++ b/ly-core/src/interop.zig
@@ -13,6 +13,9 @@ pub const utmp = @import("utmp");
 // Exists for X11 support only
 pub const xcb = @import("xcb");
 
+// FreeBSD only
+pub const sysctl = @import("sysctl");
+
 pub const TimeOfDay = struct {
     seconds: i64,
     microseconds: i64,
diff --git a/res/config.ini b/res/config.ini
index a290773..9d9fc57 100644
--- a/res/config.ini
+++ b/res/config.ini
@@ -49,6 +49,7 @@ auth_fails = 10
 # Identifier for battery whose charge to display at top left
 # Primary battery is usually BAT0 or BAT1
 # If set to null, battery status won't be shown
+# Unused on FreeBSD (a sysctl is used there)
 battery_id = null
 
 # Automatic login configuration
diff --git a/src/main.zig b/src/main.zig
index b51b55a..b756d57 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -43,8 +43,6 @@ const DisplayServer = @import("enums.zig").DisplayServer;
 const Environment = @import("Environment.zig");
 const Entry = Environment.Entry;
 
-const sysctl = if (builtin.os.tag == .freebsd) @cImport(@cInclude("sys/sysctl.h")) else struct {};
-
 const ly_version_str = "Ly version " ++ build_options.version;
 
 var session_pid: std.posix.pid_t = -1;
@@ -2323,7 +2321,7 @@ fn getBatteryPercentage(io: std.Io, battery_id: []const u8) !u8 {
         var capacity: c_int = -1;
         var size: usize = @sizeOf(c_int);
 
-        const ret = sysctl.sysctlbyname("hw.acpi.battery.life", &capacity, &size, null, 0);
+        const ret = interop.sysctl.sysctlbyname("hw.acpi.battery.life", &capacity, &size, null, 0);
 
         if (ret != 0) return error.SysctlFailed;
         if (capacity < 0 or capacity > 100) return error.InvalidBatteryCapacity;