diff --git a/src/themes.jl b/src/themes.jl
index 64f15102..c2b2aee1 100644
--- a/src/themes.jl
+++ b/src/themes.jl
@@ -140,6 +140,7 @@ _get_showtheme_args(thm::Symbol, func::Symbol) = thm, get(_color_functions, func
         subplot := 4
         seriestype := :heatmap
         seriescolor := gradient
+        ticks := -5:5:5
         x, y, z
     end