diff --git a/debian/changelog b/debian/changelog
index 8a50e372ad6a..e819bca0ab57 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,6 @@
+  [Michele Simionato]
+  * Fixed a 32/64 bit bug in `oq export loss_maps-stats`
+
 python3-oq-engine (3.11.4-1~xenial01) xenial; urgency=low
 
   [Michele Simionato]
diff --git a/openquake/risklib/scientific.py b/openquake/risklib/scientific.py
index 373ec5d215d6..864f63009f38 100644
--- a/openquake/risklib/scientific.py
+++ b/openquake/risklib/scientific.py
@@ -1036,15 +1036,18 @@ def conditional_loss_ratio(loss_ratios, poes, probability):
                               interpolate the loss curve
     """
     assert len(loss_ratios) >= 3, loss_ratios
+    probability = numpy.float32(probability)
+    if not isinstance(loss_ratios, numpy.ndarray):
+        loss_ratios = numpy.float32(loss_ratios)
+    if not isinstance(poes, numpy.ndarray):
+        poes = numpy.float32(poes)
     rpoes = poes[::-1]
     if probability > poes[0]:  # max poes
         return 0.0
     elif probability < poes[-1]:  # min PoE
         return loss_ratios[-1]
     if probability in poes:
-        return max([loss
-                    for i, loss in enumerate(loss_ratios)
-                    if probability == poes[i]])
+        return loss_ratios[probability == poes].max()
     else:
         interval_index = bisect.bisect_right(rpoes, probability)