diff --git a/usaon_benefit_tool/constants/colormap.py b/usaon_benefit_tool/constants/colormap.py
index 8d9672d0..ebcf758f 100644
--- a/usaon_benefit_tool/constants/colormap.py
+++ b/usaon_benefit_tool/constants/colormap.py
@@ -4,7 +4,7 @@
 COLORMAP_CLASSES = 8
 COLORMAP_DATA_VALUE_RANGE = (0, 100)
 
-cmap_name = 'viridis'
+cmap_name = 'viridis_r'  # "_r" means "reversed"
 cmap = colormaps[cmap_name]
 # FIXME: This duplication is only for expedience. We can do this in pure matplotlib
 #        without leafmap.