Fix compilation error.

diff --git a/src/ModelAPI/ModelAPI_Expression.cpp b/src/ModelAPI/ModelAPI_Expression.cpp
index 026c9c0f42eecd59852e9af28425d4e0f21ef6d4..bde3bffc1a184f03f1f12509ea19f9e1510f0401 100644 (file)
--- a/src/ModelAPI/ModelAPI_Expression.cpp
+++ b/src/ModelAPI/ModelAPI_Expression.cpp
@@ -21,6 +21,8 @@
 
 #include <Locale_Convert.h>
 
+#include <cwctype>
+
 ModelAPI_Expression::ModelAPI_Expression()
 {