diff --git a/src/Environment/realwx_ctrl.cxx b/src/Environment/realwx_ctrl.cxx
index 922beaa0f..a1133830e 100644
--- a/src/Environment/realwx_ctrl.cxx
+++ b/src/Environment/realwx_ctrl.cxx
@@ -27,6 +27,7 @@
 #include "realwx_ctrl.hxx"
 
 #include <algorithm>
+#include <cctype>
 
 #include <simgear/structure/exception.hxx>
 #include <simgear/misc/strutils.hxx>
diff --git a/src/Navaids/procedure.cxx b/src/Navaids/procedure.cxx
index 4dd62e276..606a0d344 100644
--- a/src/Navaids/procedure.cxx
+++ b/src/Navaids/procedure.cxx
@@ -27,6 +27,7 @@
 #include <Airports/runways.hxx>
 #include <Navaids/waypoint.hxx>
 
+#include <iterator> // required for WIN
 using std::string;
 
 namespace flightgear