diff --git a/rtengine/procparams.cc b/rtengine/procparams.cc
index c66a375cc..b91e570ef 100644
--- a/rtengine/procparams.cc
+++ b/rtengine/procparams.cc
@@ -366,7 +366,7 @@ namespace procparams
 {
 
 const short SpotParams::minRadius = 5;
-const short SpotParams::maxRadius = 100;
+const short SpotParams::maxRadius = 400;
 
 
 ToneCurveParams::ToneCurveParams() :