diff --git a/helios-core/Python/PyCXVersion.h b/helios-core/Python/PyCXVersion.h
index 345ced0..c216c97 100644
--- a/helios-core/Python/PyCXVersion.h
+++ b/helios-core/Python/PyCXVersion.h
@@ -1 +1 @@
-#define k_PYCXVersion 0.3.0
+#define k_PYCXVersion 0.3.1
diff --git a/helios-core/Source/CVCommons.h b/helios-core/Source/CVCommons.h
index 3dfe141..6820a03 100644
--- a/helios-core/Source/CVCommons.h
+++ b/helios-core/Source/CVCommons.h
@@ -1067,6 +1067,7 @@ if((capacity)<(count)+1){\
 //sleep functions
 #if __WIN32__
 #include <windows.h>
+#define CVSleepMillisecond(x) Sleep((x))
 #else
 #include <unistd.h>
 #define CVSleepMillisecond(x) usleep((x)*1000)