diff --git a/robotlab_safety/pluto_auto.py b/robotlab_safety/pluto_auto.py
index 03bc043e3016300be138ad1d501e3d471f384324..aad70ace26af7a7c20c90b658d35d160a5a4d782 100755
--- a/robotlab_safety/pluto_auto.py
+++ b/robotlab_safety/pluto_auto.py
@@ -24,6 +24,13 @@ class PlutoVariables:
             rh = [ m.group(3).format(v, pluto=self.by_name[v][0])
                    for v in self.by_name if re.match(regexp, v)]
             return("%s=%s" % (lh, '*'.join(rh)))
+        m = re.match('([^=]+)=OR\{(.*),(.*)\}', expr)
+        if m:
+            lh = m.group(1)
+            regexp = m.group(2).replace('*', '.*')
+            rh = [ m.group(3).format(v, pluto=self.by_name[v][0])
+                   for v in self.by_name if re.match(regexp, v)]
+            return("%s=%s" % (lh, '+'.join(rh)))
         raise Exception('Invalid expression', expr)