diff --git a/code/ryzom/tools/client/client_config_qt/src/client_config_dialog.cpp b/code/ryzom/tools/client/client_config_qt/src/client_config_dialog.cpp
index 5ec5b2a60..ecac3ccdb 100644
--- a/code/ryzom/tools/client/client_config_qt/src/client_config_dialog.cpp
+++ b/code/ryzom/tools/client/client_config_qt/src/client_config_dialog.cpp
@@ -172,6 +172,11 @@ void CClientConfigDialog::onClickPlay()
 	clientFullPath += "ryzom_client";
 #endif
 
+#ifndef Q_OS_WIN32
+	// fix executable permissions under UNIX
+	QFile::setPermissions(clientFullPath, QFile::permissions(clientFullPath) | QFile::ExeGroup | QFile::ExeUser | QFile::ExeOther);
+#endif
+
 	started = QProcess::startDetached(clientFullPath, arguments);
 
 	onClickOK();
diff --git a/code/ryzom/tools/client/ryzom_installer/src/main.cpp b/code/ryzom/tools/client/ryzom_installer/src/main.cpp
index 6b664ace0..3420ef42e 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/main.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/main.cpp
@@ -271,6 +271,11 @@ int main(int argc, char *argv[])
 	if (restartInstaller)
 	{
 #ifndef _DEBUG
+#ifndef Q_OS_WIN32
+		// fix executable permissions under UNIX
+		QFile::setPermissions(config.getInstallerInstalledFilePath(), QFile::permissions(config.getInstallerInstalledFilePath()) | QFile::ExeGroup | QFile::ExeUser | QFile::ExeOther);
+#endif
+
 		if (QProcess::startDetached(config.getInstallerInstalledFilePath())) return 0;
 #endif
 	}
diff --git a/code/ryzom/tools/client/ryzom_installer/src/mainwindow.cpp b/code/ryzom/tools/client/ryzom_installer/src/mainwindow.cpp
index 822570fec..d6f356f8e 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/mainwindow.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/mainwindow.cpp
@@ -137,6 +137,10 @@ void CMainWindow::onPlayClicked()
 	arguments << profile.id;
 	arguments << profile.arguments.split(' ');
 
+#ifndef Q_OS_WIN32
+	QFile::setPermissions(executable, QFile::permissions(executable) | QFile::ExeGroup | QFile::ExeUser | QFile::ExeOther);
+#endif
+
 	// launch the game with all arguments and from server root directory (to use right data)
 	bool started = QProcess::startDetached(executable, arguments, server.getDirectory());
 
@@ -164,6 +168,10 @@ void CMainWindow::onConfigureClicked()
 	arguments << "-p";
 	arguments << profile.id;
 
+#ifndef Q_OS_WIN32
+	QFile::setPermissions(executable, QFile::permissions(executable) | QFile::ExeGroup | QFile::ExeUser | QFile::ExeOther);
+#endif
+
 	bool started = QProcess::startDetached(executable, arguments);
 
 	CConfigFile::getInstance()->setDefaultProfileIndex(profileIndex);
diff --git a/code/ryzom/tools/client/ryzom_installer/src/utils.cpp b/code/ryzom/tools/client/ryzom_installer/src/utils.cpp
index 9a08b4ac8..0a31629f9 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/utils.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/utils.cpp
@@ -408,6 +408,14 @@ QString appendShortcutExtension(const QString &shortcut)
 
 QString getVersionFromExecutable(const QString &path)
 {
+	// check if file exists
+	if (!QFile::exists(path)) return "";
+
+#ifndef Q_OS_WIN32
+	// fix executable permissions under UNIX
+	QFile::setPermissions(path, QFile::permissions(path) | QFile::ExeGroup | QFile::ExeUser | QFile::ExeOther);
+#endif
+
 	// launch executable with --version argument
 	QProcess process;
 	process.setProcessChannelMode(QProcess::MergedChannels);