diff --git a/tools/apps/hgjson/DlgOptJson.cpp b/tools/apps/hgjson/DlgOptJson.cpp
index b86195d..0a923bb 100644
--- a/tools/apps/hgjson/DlgOptJson.cpp
+++ b/tools/apps/hgjson/DlgOptJson.cpp
@@ -2427,9 +2427,10 @@ void CDlgOptJson::OnBnClickedButtonModify()
 		return;
 	}
 
-	if (sop.type == L"bool" && sop.size <= sizeof(int))
+	if (((sop.type == L"bool" || sop.type == L"int") && sop.size < sizeof(int)) 
+		|| (sop.type == L"float" && sop.size < sizeof(double)))
 	{
-		MessageBox(TEXT("sizeof type 'boolean' at least 4!"));
+		MessageBox(TEXT("sizeof type 'boolean' and 'int' at least 4; 'double' at least 8!"));
 		GotoDlgCtrl(GetDlgItem(IDC_EDIT_SIZE));
 		return;
 	}
diff --git a/tools/solution/Release/hgjson.exe b/tools/solution/Release/hgjson.exe
index 443541f..d58c156 100644
Binary files a/tools/solution/Release/hgjson.exe and b/tools/solution/Release/hgjson.exe differ