diff --git a/CArunGUI/mainwindow.cpp b/CArunGUI/mainwindow.cpp
index e7ebc86..87b9495 100755
--- a/CArunGUI/mainwindow.cpp
+++ b/CArunGUI/mainwindow.cpp
@@ -9,7 +9,8 @@ char MainWindow::loadPlugIn(char lade1_entlade2)
     //pluginLoader->setFileName("../MasterPlug/libCAmaster.so");   // for suse
     //pluginLoader->setFileName("../SlavePlug/libCAslave.so");  // for ptu5
     //pluginLoader->setFileName("../../MasterPlug/CAmaster.dll"); // for windows
-    pluginLoader->setFileName("CAmaster.dll"); // for windows
+    //pluginLoader->setFileName("CAmaster.dll"); // for windows
+    pluginLoader->setFileName("/usr/lib/libCAmaster.so"); // for ptu5
 
     if (lade1_entlade2==2)
     {
diff --git a/dCArun/mainwindow.cpp b/dCArun/mainwindow.cpp
index e7ebc86..87b9495 100755
--- a/dCArun/mainwindow.cpp
+++ b/dCArun/mainwindow.cpp
@@ -9,7 +9,8 @@ char MainWindow::loadPlugIn(char lade1_entlade2)
     //pluginLoader->setFileName("../MasterPlug/libCAmaster.so");   // for suse
     //pluginLoader->setFileName("../SlavePlug/libCAslave.so");  // for ptu5
     //pluginLoader->setFileName("../../MasterPlug/CAmaster.dll"); // for windows
-    pluginLoader->setFileName("CAmaster.dll"); // for windows
+    //pluginLoader->setFileName("CAmaster.dll"); // for windows
+    pluginLoader->setFileName("/usr/lib/libCAmaster.so"); // for ptu5
 
     if (lade1_entlade2==2)
     {