diff --git a/include/wincrypt.h b/include/wincrypt.h
index 2c000c448ff..a89b117f951 100644
--- a/include/wincrypt.h
+++ b/include/wincrypt.h
@@ -428,6 +428,7 @@ typedef BOOL (WINAPI *PFN_CERT_ENUM_PHYSICAL_STORE)(const void *pvSystemStore,
 #define ALG_SID_RIPEMD160               7
 #define ALG_SID_SSL3SHAMD5              8
 #define ALG_SID_HMAC                    9
+#define ALG_SID_TLS1PRF                10
 /* SCHANNEL SIDs */
 #define ALG_SID_SSL3_MASTER             1
 #define ALG_SID_SCHANNEL_MASTER_HASH    2
@@ -445,6 +446,7 @@ typedef BOOL (WINAPI *PFN_CERT_ENUM_PHYSICAL_STORE)(const void *pvSystemStore,
 #define CALG_MAC                  (ALG_CLASS_HASH         | ALG_TYPE_ANY           | ALG_SID_MAC)
 #define CALG_SSL3_SHAMD5          (ALG_CLASS_HASH         | ALG_TYPE_ANY           | ALG_SID_SSL3SHAMD5)
 #define CALG_HMAC                 (ALG_CLASS_HASH         | ALG_TYPE_ANY           | ALG_SID_HMAC)
+#define CALG_TLS1PRF              (ALG_CLASS_HASH         | ALG_TYPE_ANY           | ALG_SID_TLS1PRF)
 #define CALG_RSA_SIGN             (ALG_CLASS_SIGNATURE    | ALG_TYPE_RSA           | ALG_SID_RSA_ANY)
 #define CALG_DSS_SIGN             (ALG_CLASS_SIGNATURE    | ALG_TYPE_DSS           | ALG_SID_DSS_ANY)
 #define CALG_RSA_KEYX             (ALG_CLASS_KEY_EXCHANGE | ALG_TYPE_RSA           | ALG_SID_RSA_ANY)