Android : How to disable zoom in aosp browers?

So basically, I'm developing a mobile website with fixed page dimensions. Using this:

<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no, minimal-ui">

doesn't help. I still can double-tap and pinch to zoom on older AOSP browsers (4.0 - 4.2.2). Does anyone have a solution for this issue? Thanks in advance!