diff --git a/owlps-positioner/src/posutil.hh b/owlps-positioner/src/posutil.hh
index 26c7a62..f4554f7 100644
--- a/owlps-positioner/src/posutil.hh
+++ b/owlps-positioner/src/posutil.hh
@@ -74,6 +74,9 @@ public:
 inline bool PosUtil::
 is_in_interval(float center, float bound, float value)
 {
+  if (bound == 0)
+    return value == center ;
+
   assert(bound > 0) ;
   float interval_min = center - bound ;
   float interval_max = center + bound ;