diff --git a/sources/interpolations.F90 b/sources/interpolations.F90
index 778de4b..edb5a3a 100644
--- a/sources/interpolations.F90
+++ b/sources/interpolations.F90
@@ -224,7 +224,7 @@ module interpolations
 
 ! calculate κ = (1 - ν) / ν
 !
-    kappa = min(kappa, (1.0d+00 - cfl) / cfl)
+    kappa = max(kappa, (1.0d+00 - cfl) / cfl)
 
 ! correct central weight
 !