diff --git a/src/kdeinit/kinit_win.cpp b/src/kdeinit/kinit_win.cpp
--- a/src/kdeinit/kinit_win.cpp
+++ b/src/kdeinit/kinit_win.cpp
@@ -39,6 +39,7 @@
 #include <QProcess>
 #include <QFileInfo>
 #include <QDebug>
+#include <QLibraryInfo>
 
 // Under wince interface is defined, so undef it otherwise it breaks it
 #undef interface
@@ -199,6 +200,11 @@
     return getProcessOwner(GetCurrentProcess());
 }
 
+static QString installRoot()
+{
+    return QLibraryInfo::location(QLibraryInfo::PrefixPath);
+}
+
 /**
  holds single process
  */
@@ -342,6 +348,7 @@
 ProcessListEntry *ProcessList::find(const QString &name)
 {
     ProcessListEntry *ple;
+    QString installPrefix = installRoot();
     foreach (ple, m_processes) {
         if (ple->pid < 0) {
             qDebug() << "negative pid!";
@@ -352,9 +359,9 @@
             continue;
         }
 
-        if (!ple->path.isEmpty() && !ple->path.toLower().startsWith(QString(QStringLiteral(CMAKE_INSTALL_PREFIX)).toLower())) {
+        if (!ple->path.isEmpty() && !ple->path.toLower().startsWith(installPrefix.toLower())) {
             // process is outside of installation directory
-            qDebug() << "path of the process" << name << "seems to be outside of the installPath:" << ple->path << QStringLiteral(CMAKE_INSTALL_PREFIX);
+            qDebug() << "path of the process" << name << "seems to be outside of the installPath:" << ple->path << installPrefix;
             continue;
         }
         return ple;
@@ -434,7 +441,7 @@
 
 void listAllRunningKDEProcesses(ProcessList &processList)
 {
-    QString installPrefix = QStringLiteral(CMAKE_INSTALL_PREFIX);
+    QString installPrefix = installRoot();
 
     foreach (const ProcessListEntry *ple, processList.list()) {
         if (!ple->path.isEmpty() && ple->path.toLower().startsWith(installPrefix.toLower())) {
@@ -445,7 +452,7 @@
 
 void terminateAllRunningKDEProcesses(ProcessList &processList)
 {
-    QString installPrefix = QStringLiteral(CMAKE_INSTALL_PREFIX);
+    QString installPrefix = installRoot();
 
     foreach (const ProcessListEntry *ple, processList.list()) {
         if (!ple->path.isEmpty() && ple->path.toLower().startsWith(installPrefix.toLower())) {