diff --git a/include/psapi.h b/include/psapi.h
index bb7d1cf660e..f0317241d31 100644
--- a/include/psapi.h
+++ b/include/psapi.h
@@ -28,16 +28,16 @@ typedef struct _MODULEINFO {
 } MODULEINFO, *LPMODULEINFO;
 
 typedef struct _PROCESS_MEMORY_COUNTERS {
-  DWORD cb;
-  DWORD PageFaultCount;
-  DWORD PeakWorkingSetSize;
-  DWORD WorkingSetSize;
-  DWORD QuotaPeakPagedPoolUsage;
-  DWORD QuotaPagedPoolUsage;
-  DWORD QuotaPeakNonPagedPoolUsage;
-  DWORD QuotaNonPagedPoolUsage;
-  DWORD PagefileUsage;
-  DWORD PeakPagefileUsage;
+  DWORD  cb;
+  DWORD  PageFaultCount;
+  SIZE_T PeakWorkingSetSize;
+  SIZE_T WorkingSetSize;
+  SIZE_T QuotaPeakPagedPoolUsage;
+  SIZE_T QuotaPagedPoolUsage;
+  SIZE_T QuotaPeakNonPagedPoolUsage;
+  SIZE_T QuotaNonPagedPoolUsage;
+  SIZE_T PagefileUsage;
+  SIZE_T PeakPagefileUsage;
 } PROCESS_MEMORY_COUNTERS;
 typedef PROCESS_MEMORY_COUNTERS *PPROCESS_MEMORY_COUNTERS;