diff --git a/windows/winsftp.c b/windows/winsftp.c
index 572aa48c..60551c99 100644
--- a/windows/winsftp.c
+++ b/windows/winsftp.c
@@ -102,8 +102,12 @@ RFile *open_existing_file(const char *name, uint64 *size,
     ret = snew(RFile);
     ret->h = h;
 
-    if (size)
-        size->lo=GetFileSize(h, &(size->hi));
+    if (size) {
+        DWORD lo, hi;
+        lo = GetFileSize(h, &hi);
+        size->lo = lo;
+        size->hi = hi;
+    }
 
     if (mtime || atime) {
 	FILETIME actime, wrtime;
@@ -170,8 +174,12 @@ WFile *open_existing_wfile(const char *name, uint64 *size)
     ret = snew(WFile);
     ret->h = h;
 
-    if (size)
-	size->lo=GetFileSize(h, &(size->hi));
+    if (size) {
+        DWORD lo, hi;
+        lo = GetFileSize(h, &hi);
+        size->lo = lo;
+        size->hi = hi;
+    }
 
     return ret;
 }
@@ -221,7 +229,10 @@ int seek_file(WFile *f, uint64 offset, int whence)
 	return -1;
     }
 
-    SetFilePointer(f->h, offset.lo, &(offset.hi), movemethod);
+    {
+        LONG lo = offset.lo, hi = offset.hi;
+        SetFilePointer(f->h, lo, &hi, movemethod);
+    }
     
     if (GetLastError() != NO_ERROR)
 	return -1;
@@ -232,9 +243,11 @@ int seek_file(WFile *f, uint64 offset, int whence)
 uint64 get_file_posn(WFile *f)
 {
     uint64 ret;
+    LONG lo, hi;
 
-    ret.hi = 0L;
-    ret.lo = SetFilePointer(f->h, 0L, &(ret.hi), FILE_CURRENT);
+    lo = SetFilePointer(f->h, 0L, &hi, FILE_CURRENT);
+    ret.lo = lo;
+    ret.hi = hi;
 
     return ret;
 }