diff --git a/reactos/dll/ntdll/ldr/utils.c b/reactos/dll/ntdll/ldr/utils.c
index 1cfb8c85505..4b085391e92 100644
--- a/reactos/dll/ntdll/ldr/utils.c
+++ b/reactos/dll/ntdll/ldr/utils.c
@@ -3236,9 +3236,9 @@ LdrpGetResidentSize(PIMAGE_NT_HEADERS NTHeaders)
  */
 NTSTATUS NTAPI
 LdrVerifyImageMatchesChecksum (IN HANDLE FileHandle,
-                               ULONG Unknown1,
-                               ULONG Unknown2,
-                               ULONG Unknown3)
+                               IN PLDR_CALLBACK Callback,
+                               IN PVOID CallbackContext,
+                               OUT PUSHORT ImageCharacterstics)
 {
   FILE_STANDARD_INFORMATION FileInfo;
   IO_STATUS_BLOCK IoStatusBlock;
diff --git a/reactos/include/ndk/umfuncs.h b/reactos/include/ndk/umfuncs.h
index 4cbee159ca7..a3721733e3a 100644
--- a/reactos/include/ndk/umfuncs.h
+++ b/reactos/include/ndk/umfuncs.h
@@ -295,13 +295,14 @@ LdrUnloadDll(
     IN PVOID BaseAddress
 );
 
+typedef VOID NTAPI (*PLDR_CALLBACK)(PVOID CallbackContext, PVOID Name);
 NTSTATUS
 NTAPI
 LdrVerifyImageMatchesChecksum(
     IN HANDLE FileHandle,
-    ULONG Unknown1,
-    ULONG Unknown2,
-    ULONG Unknown3
+    IN PLDR_CALLBACK Callback,
+    IN PVOID CallbackContext,
+    OUT PUSHORT ImageCharacterstics
 );
 
 #endif