Pienaar has watched from the stands in the past few games and noticed a South African flag draped over the advertising hoardings with his nation's emblem upside down.
He said: "I saw it was upside down again. Every time I looked over, it was just annoying me!
"To get a goal, to go over to put it right, was a great thing. I would have picked it up and worn it but I was scared I would get a yellow card so I left it where it was. But at least I've put it right!"
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