diff --git a/config/snpm_bch_ui_PairT.m b/config/snpm_bch_ui_PairT.m
index dee7b41..1ff0fb4 100644
--- a/config/snpm_bch_ui_PairT.m
+++ b/config/snpm_bch_ui_PairT.m
@@ -35,6 +35,9 @@
 % Reuse flexible factorial component of SPM to get the design files and
 % associated conditions
 factorial_design = spm_cfg_factorial_design();
+if isa(factorial_design.val,'function_handle')
+    factorial_design.val = feval(factorial_design.val);
+end
 sub_files = factorial_design.val{2}.values{end}.val{2}.val{1};
 
 % We expect exactly two files per subject
diff --git a/config/snpm_bch_ui_TwoSampPairT.m b/config/snpm_bch_ui_TwoSampPairT.m
index e1965ef..06a1a11 100644
--- a/config/snpm_bch_ui_TwoSampPairT.m
+++ b/config/snpm_bch_ui_TwoSampPairT.m
@@ -28,6 +28,9 @@
 % Reuse flexible factorial component of SPM to get the design files and
 % associated conditions
 factorial_design = spm_cfg_factorial_design();
+if isa(factorial_design.val,'function_handle')
+    factorial_design.val = feval(factorial_design.val);
+end
 sub_files = factorial_design.val{2}.values{end}.val{2}.val{1};
 
 % We expect exactly two files per subject