diff --git a/powertop-1.98-add-power-supply-class-support.patch b/powertop-1.98-add-power-supply-class-support.patch
index 27d5cea..a504bd7 100644
--- a/powertop-1.98-add-power-supply-class-support.patch
+++ b/powertop-1.98-add-power-supply-class-support.patch
@@ -27,7 +27,7 @@ diff --git a/measurement/measurement.cpp b/measurement/measurement.cpp
 index 3dbaab9..0d679f7 100644
 --- a/measurement/measurement.cpp
 +++ b/measurement/measurement.cpp
-@@ -25,11 +25,14 @@
+@@ -25,11 +25,15 @@
  #include "measurement.h"
  #include "acpi.h"
  #include "extech.h"
@@ -37,6 +37,7 @@ index 3dbaab9..0d679f7 100644
  
  #include <sys/types.h>
  #include <dirent.h>
++#include <unistd.h>
 +#include <stdio.h>
 +#include <fstream>