diff --git a/app/SysTray-X/windowctrl-win.cpp b/app/SysTray-X/windowctrl-win.cpp
index ef7e214..fcd5870 100644
--- a/app/SysTray-X/windowctrl-win.cpp
+++ b/app/SysTray-X/windowctrl-win.cpp
@@ -100,7 +100,7 @@ Preferences::MinimizeType    WindowCtrlWin::getMinimizeType() const
 /*
  *  Get the parent pid of SysTray-X, TB hopefully
  */
-qint64  WindowCtrlWin::getPpid()
+qint64  WindowCtrlWin::getPpid() const
 {
     HANDLE h = CreateToolhelp32Snapshot( TH32CS_SNAPPROCESS, 0 );
     PROCESSENTRY32 pe;
@@ -131,7 +131,7 @@ qint64  WindowCtrlWin::getPpid()
 /*
  *  Is the pid from thunderbird
  */
-bool    WindowCtrlWin::isThunderbird( qint64 pid )
+bool    WindowCtrlWin::isThunderbird( qint64 pid ) const
 {
     return getProcessName( pid ).contains( "thunderbird", Qt::CaseInsensitive );
 }
@@ -140,7 +140,7 @@ bool    WindowCtrlWin::isThunderbird( qint64 pid )
 /*
  *  Get the process name
  */
-QString WindowCtrlWin::getProcessName( qint64 pid )
+QString WindowCtrlWin::getProcessName( qint64 pid ) const
 {
     HANDLE proc = OpenProcess( PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, false, pid );
     char name[ 256 ];
diff --git a/app/SysTray-X/windowctrl-win.h b/app/SysTray-X/windowctrl-win.h
index 2db7905..b42f6fc 100644
--- a/app/SysTray-X/windowctrl-win.h
+++ b/app/SysTray-X/windowctrl-win.h
@@ -97,7 +97,7 @@ class WindowCtrlWin : public QObject
          *
          *  @return     The ppid
          */
-        qint64  getPpid();
+        qint64  getPpid() const;
 
         /**
          * @brief isThunderbird. Is this a thunderbird pid.
@@ -106,7 +106,7 @@ class WindowCtrlWin : public QObject
          *
          *  @return     True if this is thunderbird.
          */
-        bool    isThunderbird( qint64 pid );
+        bool    isThunderbird( qint64 pid ) const;
 
         /**
          * @brief getProcessName. Get the name of the proces by pid.
@@ -115,7 +115,7 @@ class WindowCtrlWin : public QObject
          *
          *  @return     The process name.
          */
-        QString getProcessName( qint64 pid );
+        QString getProcessName( qint64 pid ) const;
 
         /**
          * @brief findWindow. Find window by title.