diff --git a/kcollectd/gui.cc b/kcollectd/gui.cc
index 8baabb8..a344f47 100644
--- a/kcollectd/gui.cc
+++ b/kcollectd/gui.cc
@@ -21,6 +21,7 @@
 #include <iostream>
 #include <set>
 #include <sstream>
+#include <stack>
 
 #include <boost/filesystem.hpp>