diff --git a/reactos/dll/win32/kernel32/process/proc.c b/reactos/dll/win32/kernel32/process/proc.c
index ea9a23e6b56..41889ec8b4a 100644
--- a/reactos/dll/win32/kernel32/process/proc.c
+++ b/reactos/dll/win32/kernel32/process/proc.c
@@ -1011,7 +1011,7 @@ WINAPI
 IsWow64Process(HANDLE hProcess,
                PBOOL Wow64Process)
 {
-    ULONG pbi;
+    ULONG_PTR pbi;
     NTSTATUS Status;
 
     Status = NtQueryInformationProcess(hProcess,