diff --git a/sdk/include/reactos/subsys/csr/csrsrv.h b/sdk/include/reactos/subsys/csr/csrsrv.h
index 8634d3cf834..39fc5adfd2e 100644
--- a/sdk/include/reactos/subsys/csr/csrsrv.h
+++ b/sdk/include/reactos/subsys/csr/csrsrv.h
@@ -427,7 +427,7 @@ CsrValidateMessageBuffer(IN PCSR_API_MESSAGE ApiMessage,
 BOOLEAN
 NTAPI
 CsrValidateMessageString(IN PCSR_API_MESSAGE ApiMessage,
-                         IN LPWSTR *MessageString);
+                         IN PWSTR *MessageString);
 
 #endif // _CSRSRV_H
 
diff --git a/subsystems/win32/csrsrv/api.c b/subsystems/win32/csrsrv/api.c
index 57da1950ca8..e8b845597e3 100644
--- a/subsystems/win32/csrsrv/api.c
+++ b/subsystems/win32/csrsrv/api.c
@@ -1401,7 +1401,7 @@ CsrValidateMessageBuffer(IN PCSR_API_MESSAGE ApiMessage,
 BOOLEAN
 NTAPI
 CsrValidateMessageString(IN PCSR_API_MESSAGE ApiMessage,
-                         IN LPWSTR *MessageString)
+                         IN PWSTR *MessageString)
 {
     if (MessageString)
     {