diff --git a/win/win32/mhmain.c b/win/win32/mhmain.c
index 523c3636d..8473f498b 100644
--- a/win/win32/mhmain.c
+++ b/win/win32/mhmain.c
@@ -1130,7 +1130,7 @@ void nhlock_windows( BOOL lock )
 	for( i=0; i<MAXWINDOWS; i++ ) {
 		if( IsWindow(GetNHApp()->windowlist[i].win) && !GetNHApp()->windowlist[i].dead) {
 			DWORD style;
-			style = GetWindowLongPtr(GetNHApp()->windowlist[i].win, GWL_STYLE);
+			style = (DWORD)GetWindowLongPtr(GetNHApp()->windowlist[i].win, GWL_STYLE);
 			if( lock )	style &= ~WS_CAPTION;
 			else		style |= WS_CAPTION;
 			SetWindowLongPtr(GetNHApp()->windowlist[i].win, GWL_STYLE, style);
diff --git a/win/win32/mhmenu.c b/win/win32/mhmenu.c
index 2f123550f..181caa446 100644
--- a/win/win32/mhmenu.c
+++ b/win/win32/mhmenu.c
@@ -121,7 +121,7 @@ HWND mswin_init_menu_window (int type) {
 
 	if( !GetNHApp()->bWindowsLocked ) {
 		DWORD style;
-		style = GetWindowLongPtr(ret, GWL_STYLE);
+		style = (DWORD)GetWindowLongPtr(ret, GWL_STYLE);
 		style |= WS_CAPTION;
 		SetWindowLongPtr(ret, GWL_STYLE, style);
 		SetWindowPos(ret, NULL, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED);
diff --git a/win/win32/mhtext.c b/win/win32/mhtext.c
index 8a217d61b..2c16f0c2d 100644
--- a/win/win32/mhtext.c
+++ b/win/win32/mhtext.c
@@ -53,7 +53,7 @@ HWND mswin_init_text_window () {
 	SetWindowText(ret, "Text");
 	if( !GetNHApp()->bWindowsLocked ) {
 		DWORD style;
-		style = GetWindowLongPtr(ret, GWL_STYLE);
+		style = (DWORD)GetWindowLongPtr(ret, GWL_STYLE);
 		style |= WS_CAPTION;
 		SetWindowLongPtr(ret, GWL_STYLE, style);
 		SetWindowPos(ret, NULL, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_FRAMECHANGED);