diff --git a/symfit/core/argument.py b/symfit/core/argument.py
index d3caee50..208e4efc 100644
--- a/symfit/core/argument.py
+++ b/symfit/core/argument.py
@@ -121,11 +121,7 @@ def __init__(self, name=None, value=1.0, min=None, max=None, fixed=False, **assu
         self.fixed = fixed
 
         if min is not None and max is not None:
-            test = min > max
-            if isinstance(test, np.ndarray):
-                test = test.any()
-
-            if test and not self.fixed:
+            if np.any(min > max) and not self.fixed:
                 raise ValueError('The value of `min` should be less than or'
                                  ' equal to the value of `max`.')