diff --git a/navis/morpho/mmetrics.py b/navis/morpho/mmetrics.py
index dcd8c415..7864326e 100644
--- a/navis/morpho/mmetrics.py
+++ b/navis/morpho/mmetrics.py
@@ -30,6 +30,12 @@
 # Set up logging
 logger = config.get_logger(__name__)
 
+# Set up numpy number representation, see NEP51
+# Once numpy<=2 is dropped from requirements, the doctest comparissons
+# should become `np.float64(1.074)` instead of `1.074`
+if int(np.version.version.split('.')[0])>=2:
+    np.set_printoptions(legacy="1.25")
+
 __all__ = sorted(
     [
         "strahler_index",