diff --git a/CHANGES.rst b/CHANGES.rst
index 15d08f2950..6b6e1ebbb7 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -4,6 +4,9 @@ unreleased
 Features
 --------
 
+- The ``aslist`` method now handles non-string object when flattening.
+  See https://github.com/Pylons/pyramid/pull/3594
+
 - It is now possible to pass multiple values to the ``header`` predicate
   for route and view configuration.
   See https://github.com/Pylons/pyramid/pull/3576
diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index 550639ae0a..d527b1a042 100644
--- a/CONTRIBUTORS.txt
+++ b/CONTRIBUTORS.txt
@@ -352,3 +352,5 @@ Contributors
 - Andrea Borghi, 2019/11/11
 
 - Sergey Maranchuk, 2020/04/18
+
+- Thibault Ravera, 2020/06/03
\ No newline at end of file
diff --git a/src/pyramid/settings.py b/src/pyramid/settings.py
index d1eb4ff141..d6e4ea9b21 100644
--- a/src/pyramid/settings.py
+++ b/src/pyramid/settings.py
@@ -21,14 +21,18 @@ def aslist_cronly(value):
 
 
 def aslist(value, flatten=True):
-    """ Return a list of strings, separating the input based on newlines
-    and, if flatten=True (the default), also split on spaces within
-    each line."""
+    """ Return a list, separating the input based on newlines.
+    Also if ``flatten`` is ``True`` (the default), and if the line
+    is a string, then the line will be split on spaces.
+    """
     values = aslist_cronly(value)
     if not flatten:
         return values
     result = []
     for value in values:
-        subvalues = value.split()
-        result.extend(subvalues)
+        if isinstance(value, str):
+            value = value.split()
+            result.extend(value)
+        else:
+            result.append(value)
     return result
diff --git a/tests/test_settings.py b/tests/test_settings.py
index e8be490ee8..457835663e 100644
--- a/tests/test_settings.py
+++ b/tests/test_settings.py
@@ -69,6 +69,14 @@ def test_with_list(self):
         result = self._callFUT(['abc', 'def'])
         self.assertEqual(list(result), ['abc', 'def'])
 
+    def test_with_integer(self):
+        result = self._callFUT([1])
+        self.assertEqual(result, [1])
+
+    def test_with_integer_no_flatten(self):
+        result = self._callFUT([1], flatten=False)
+        self.assertEqual(result, [1])
+
     def test_with_string(self):
         result = self._callFUT('abc def')
         self.assertEqual(result, ['abc', 'def'])
@@ -84,3 +92,7 @@ def test_with_string_crsep_spacesep(self):
     def test_with_string_crsep_spacesep_no_flatten(self):
         result = self._callFUT(' abc\n def ghi ', flatten=False)
         self.assertEqual(result, ['abc', 'def ghi'])
+
+    def test_with_string_crsep_spacesep_and_integer(self):
+        result = self._callFUT([' abc def ghi ', 1])
+        self.assertEqual(result, ['abc', 'def', 'ghi', 1])