How to shift the ticks of a heat map?

I try to see a correlation matrix in Julia.Plots and the axis are shifted half tick away from where I expect them.

using Plots
using PlotThemes

rho = cor(Return1D)

ticks_ = (1:1:length(tickers)+1, tickers)
size_ = length(tickers) * 16
heatmap(tickers, tickers, rho, ticks = ticks_, aspect_ratio = 1, size = (size_, size_), c = :RdYlGn_11, xrotation = 90, legend = false)

How can I shift the ticks half step lower on Y and to the left on X?