diff --git a/src/crop/aquacrop.jl b/src/crop/aquacrop.jl
index 678c50faf501a20361689c2fae7ba1a8ed8dd14f..54d12a99d91ac339ac0f3fb025b4fb677dbfc9ae 100644
--- a/src/crop/aquacrop.jl
+++ b/src/crop/aquacrop.jl
@@ -188,7 +188,7 @@ cropname(cs::CropState) = cropname(croptype(cs))
 function cropheight(cs::CropState)
     biomass = get_aquacrop_biomass(cs)
     # TODO: linear model, fixed params
-    a = 5cm
+    a = 2cm
     b = 6u"cm * ha" / ton
     return a + b * biomass
 end