diff --git a/mingw-w64-headers/include/ChangeLog b/mingw-w64-headers/include/ChangeLog
index a18b470..d7d3ee4 100644
--- a/mingw-w64-headers/include/ChangeLog
+++ b/mingw-w64-headers/include/ChangeLog
@@ -1,5 +1,10 @@
 2011-08-07  Ozkan Sezer  <sezeroz@gmail.com>
 
+	* wincrypt.h: Added MS_ENH_RSA_AES_PROV_XP[_A|_W]. (Thanks to Alon
+	Bar-Lev.)
+
+2011-08-07  Ozkan Sezer  <sezeroz@gmail.com>
+
 	* psdk_inc/_socket_types.h: Provide the SOCKET type as unsigned.
 
 2011-07-23  Ozkan Sezer  <sezeroz@gmail.com>
diff --git a/mingw-w64-headers/include/wincrypt.h b/mingw-w64-headers/include/wincrypt.h
index 1ecaefb..8a898b0 100644
--- a/mingw-w64-headers/include/wincrypt.h
+++ b/mingw-w64-headers/include/wincrypt.h
@@ -473,12 +473,15 @@
 
 #define MS_SCARD_PROV __MINGW_NAME_UAW(MS_SCARD_PROV)
 #define MS_ENH_RSA_AES_PROV __MINGW_NAME_UAW(MS_ENH_RSA_AES_PROV)
+#define MS_ENH_RSA_AES_PROV_XP __MINGW_NAME_UAW(MS_ENH_RSA_AES_PROV_XP)
 
 #define MS_SCARD_PROV_A "Microsoft Base Smart Card Crypto Provider"
 #define MS_SCARD_PROV_W L"Microsoft Base Smart Card Crypto Provider"
 
 #define MS_ENH_RSA_AES_PROV_A "Microsoft Enhanced RSA and AES Cryptographic Provider"
 #define MS_ENH_RSA_AES_PROV_W L"Microsoft Enhanced RSA and AES Cryptographic Provider"
+#define MS_ENH_RSA_AES_PROV_XP_A "Microsoft Enhanced RSA and AES Cryptographic Provider (Prototype)"
+#define MS_ENH_RSA_AES_PROV_XP_W L"Microsoft Enhanced RSA and AES Cryptographic Provider (Prototype)"
 
 #define MAXUIDLEN 64