diff --git a/winsup/w32api/ChangeLog b/winsup/w32api/ChangeLog
index 207510f07..4ee98acb3 100644
--- a/winsup/w32api/ChangeLog
+++ b/winsup/w32api/ChangeLog
@@ -1,3 +1,10 @@
+2006-04-07  Dimitri Papadopoulos  <papadopo@users.sourceforge.net>
+
+	* include/wincrypt.h (PROV_MS_EXCHANGE): Define.
+	We should probably remove PROV_MS_MAIL but I'm keeping it for
+	now for compatibility reasons.
+	Thanks to:    Marcus Agehall <agehall at users dot sf dot net>
+
 2006-04-07  Dimitri Papadopoulos  <papadopo@users.sourceforge.net>
 
 	* include/commdlg.h [WINVER >= 0x0500]
diff --git a/winsup/w32api/include/wincrypt.h b/winsup/w32api/include/wincrypt.h
index d4a87d3f5..2cdf2a4d4 100644
--- a/winsup/w32api/include/wincrypt.h
+++ b/winsup/w32api/include/wincrypt.h
@@ -205,6 +205,7 @@ extern "C" {
 #define PROV_RSA_SIG 2
 #define PROV_DSS 3
 #define PROV_FORTEZZA 4
+#define PROV_MS_EXCHANGE 5
 #define PROV_MS_MAIL 5
 #define PROV_SSL 6
 #define PROV_STT_MER 7