diff --git a/tools/mkclass/classcompiler.cpp b/tools/mkclass/classcompiler.cpp
index 203e90f80..dbe888e16 100644
--- a/tools/mkclass/classcompiler.cpp
+++ b/tools/mkclass/classcompiler.cpp
@@ -24,6 +24,9 @@
 #include <map>
 #include <vector>
 #include <cstring>
+#ifndef _WIN32
+#include <libgen.h>
+#endif /* _WIN32 */
 
 using namespace icinga;