diff --git a/fsl/data/featanalysis.py b/fsl/data/featanalysis.py
index 246722b576e47abb5acf9de89cc714c952e1d421..7c38eb7773465fa79cc952e4038c38451e7e3b97 100644
--- a/fsl/data/featanalysis.py
+++ b/fsl/data/featanalysis.py
@@ -385,6 +385,12 @@ def loadClusterResults(featdir, settings, contrast):
 
                 setattr(self, attrName, val)
 
+            # if cluster thresholding was not used,
+            # the cluster table will not contain
+            # P valuse.
+            if not hasattr(self, 'p'):    self.p    = 1.0
+            if not hasattr(self, 'logp'): self.logp = 0.0
+
     # This dict provides a mapping between
     # Cluster object attribute names, and
     # the corresponding column name in the