diff --git a/reactos/dll/win32/advapi32/crypt/crypt.c b/reactos/dll/win32/advapi32/crypt/crypt.c
index c3351a576b1..ee2380cee90 100644
--- a/reactos/dll/win32/advapi32/crypt/crypt.c
+++ b/reactos/dll/win32/advapi32/crypt/crypt.c
@@ -618,7 +618,7 @@ BOOL WINAPI CryptContextAddRef (HCRYPTPROV hProv, DWORD *pdwReserved, DWORD dwFl
  *  Success: TRUE
  *  Failure: FALSE
  */
-BOOL WINAPI CryptReleaseContext (HCRYPTPROV hProv, ULONG_PTR dwFlags)
+BOOL WINAPI CryptReleaseContext (HCRYPTPROV hProv, DWORD dwFlags)
 {
 	PCRYPTPROV pProv = (PCRYPTPROV)hProv;
 	BOOL ret = TRUE;
diff --git a/reactos/dll/win32/advapi32/crypt/ros_diff.patch b/reactos/dll/win32/advapi32/crypt/ros_diff.patch
new file mode 100644
index 00000000000..a6c0c08c138
--- /dev/null
+++ b/reactos/dll/win32/advapi32/crypt/ros_diff.patch
@@ -0,0 +1,13 @@
+Index: crypt.c
+===================================================================
+--- crypt.c	(Revision 48087)
++++ crypt.c	(Arbeitskopie)
+@@ -618,7 +618,7 @@
+  *  Success: TRUE
+  *  Failure: FALSE
+  */
+-BOOL WINAPI CryptReleaseContext (HCRYPTPROV hProv, ULONG_PTR dwFlags)
++BOOL WINAPI CryptReleaseContext (HCRYPTPROV hProv, DWORD dwFlags)
+ {
+ 	PCRYPTPROV pProv = (PCRYPTPROV)hProv;
+ 	BOOL ret = TRUE;