diff --git a/skullTo3d/utils/utils_params.py b/skullTo3d/utils/utils_params.py
index 54a07eb..962a53e 100644
--- a/skullTo3d/utils/utils_params.py
+++ b/skullTo3d/utils/utils_params.py
@@ -105,6 +105,30 @@ def update_skull_params(ssoft, params):
                 print('deleting skullmask_ct_pipe')
                 del spp["skullmask_ct_pipe"]
 
+    # if no brain seg mask, removed fullskullmask
+    if "noseg" in ssoft or "prep" in ssoft:
+
+        if "skull_petra_pipe" in params:
+            spp = params["skull_petra_pipe"]
+
+            if "fullskullmask_petra_pipe" in spp:
+                print('deleting fullskullmask_petra_pipe')
+                del spp["fullskullmask_petra_pipe"]
+
+        if "skull_megre_pipe" in params:
+            smp = params["skull_megre_pipe"]
+
+            if "fullskullmask_megre_pipe" in smp:
+                print('deleting fullskullmask_megre_pipe')
+                del smp["fullskullmask_megre_pipe"]
+
+        if "skull_t1_pipe" in params:
+            spp = params["skull_t1_pipe"]
+
+            if "fullskullmask_t1_pipe" in spp:
+                print('deleting fullskullmask_t1_pipe')
+                del spp["fullskullmask_t1_pipe"]
+
     return params