diff --git a/amatos2d/src/gridgen/FEM_signature.F90 b/amatos2d/src/gridgen/FEM_signature.F90
index cf281c08c006075cc8f5bb421d8df02f44c86178..43901d8f53f02b8aec65aaf7d0b72de7d8f185bf 100644
--- a/amatos2d/src/gridgen/FEM_signature.F90
+++ b/amatos2d/src/gridgen/FEM_signature.F90
@@ -80,7 +80,7 @@ MODULE FEM_signature
   INTEGER (KIND = GRID_SI), PARAMETER                :: DEF_femelmtpos=3_GRID_SI
   INTEGER (KIND = GRID_SI), PARAMETER                :: DEF_itemtypes =DEF_femelmtpos
   INTEGER (KIND = GRID_SI), PARAMETER                :: DEF_femtypepos=DEF_itemtypes+1
-  INTEGER (KIND = GRID_SI), PARAMETER                :: DEF_varpatsize=16_GRID_SI
+  INTEGER (KIND = GRID_SI), PARAMETER                :: DEF_varpatsize=64_GRID_SI
 
   INTEGER (KIND = GRID_SI), DIMENSION(:,:), POINTER  :: i_varpattern
   INTEGER (KIND = GRID_SI)                           :: i_maxfemvars