diff --git a/windows/Libyate.vcproj b/windows/Libyate.vcproj
index b1478524..e841ed70 100644
--- a/windows/Libyate.vcproj
+++ b/windows/Libyate.vcproj
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="Windows-1252"?>
 <VisualStudioProject
 	ProjectType="Visual C++"
-	Version="8.00"
+	Version="8,00"
 	Name="Libyate"
 	ProjectGUID="{254C6F00-6DE5-44A6-AD44-ACABA8912381}"
 	RootNamespace="Libyate"
@@ -433,6 +433,10 @@
 					/>
 				</FileConfiguration>
 			</File>
+			<File
+				RelativePath="..\engine\Math.cpp"
+				>
+			</File>
 			<File
 				RelativePath="..\engine\Message.cpp"
 				>
@@ -762,6 +766,10 @@
 				RelativePath="..\yateclass.h"
 				>
 			</File>
+			<File
+				RelativePath="..\yatemath.h"
+				>
+			</File>
 			<File
 				RelativePath="..\yatemime.h"
 				>
diff --git a/yatemath.h b/yatemath.h
index cd18ff7c..3e9f8d88 100644
--- a/yatemath.h
+++ b/yatemath.h
@@ -5,7 +5,7 @@
  * Math data types
  *
  * Yet Another Telephony Engine - a fully featured software PBX and IVR
- * Copyright (C) 2004-2014 Null Team
+ * Copyright (C) 2015 Null Team
  *
  * This software is distributed under multiple licenses;
  * see the COPYING file in the main directory for licensing
@@ -29,10 +29,17 @@
 namespace TelEngine {
 
 #ifdef DEBUG
+#ifdef _WINDOWS
+#define YMATH_FAIL(cond,...) { \
+    if (!(cond)) \
+	Debug(DebugFail,__VA_ARGS__); \
+}
+#else
 #define YMATH_FAIL(cond,args...) { \
     if (!(cond)) \
 	Debug(DebugFail,args); \
 }
+#endif
 #else
 #ifdef _WINDOWS
 #define YMATH_FAIL do { break; } while
@@ -379,7 +386,7 @@ private:
  * Its purpose is to offer a common interface when processing lists
  * @short Base class for vector class(es)
  */
-class MathVectorBase : public GenObject
+class YATE_API MathVectorBase : public GenObject
 {
     YCLASS(MathVectorBase,GenObject)
 public: