diff --git a/src/OpenMesh/Core/IO/reader/BaseReader.hh b/src/OpenMesh/Core/IO/reader/BaseReader.hh
index 1089d33c..7716c1c7 100644
--- a/src/OpenMesh/Core/IO/reader/BaseReader.hh
+++ b/src/OpenMesh/Core/IO/reader/BaseReader.hh
@@ -58,6 +58,7 @@
 #include <iostream>
 #include <string>
 #include <cctype>
+#include <functional>
 
 // OpenMesh
 #include <OpenMesh/Core/System/config.h>