diff --git a/Rakefile b/Rakefile
index 328f3bc..125c7ec 100644
--- a/Rakefile
+++ b/Rakefile
@@ -14,7 +14,7 @@ end
 desc 'Checks style'
 task audit: :rubocop
 task :audit do
-  ignores = %w(D100 D101 D102 D103 D104 E501 I201)
+  ignores = %w(D100 D101 D102 D103 D104 E501 I201 N806)
 
   FILES = FileList[%w(bin/compose_format compose_format/*.py setup.py)]
   sh "flake8 --ignore='#{ignores * ','}' #{FILES}"
diff --git a/compose_format/__init__.py b/compose_format/__init__.py
index afa26bc..5223715 100755
--- a/compose_format/__init__.py
+++ b/compose_format/__init__.py
@@ -1,5 +1,6 @@
 from ruamel.yaml import RoundTripDumper, RoundTripLoader, dump, load
 from ruamel.yaml.comments import CommentedMap, CommentedSeq
+from ruamel.yaml.scalarstring import SingleQuotedScalarString
 
 
 class ComposeFormat:
@@ -98,10 +99,22 @@ def reorder(data, strict=True):
                 ComposeFormat.reorder(item, strict)
             return data
         if type(data) is CommentedSeq:
+            for i, value in enumerate(data):
+                data[i] = ComposeFormat.fix_sexadecimal_numbers(value)
             data.sort()
             return data
         return data
 
+    @staticmethod
+    def fix_sexadecimal_numbers(value):
+        import re
+
+        SEXADECIMAL_NUMBER = '(?P<left>\d+):(?P<right>\d+)'
+        match = re.match(SEXADECIMAL_NUMBER, value)
+        if not match or int(match.group('left')) > 60 or int(match.group('right')) > 60:
+            return value
+        return SingleQuotedScalarString('{0}:{1}'.format(match.group('left'), match.group('right')))
+
     @staticmethod
     def order_map(keys):
         for key in ComposeFormat.ORDERS.keys():
diff --git a/features/format.feature b/features/format.feature
index a1de579..363f0f1 100644
--- a/features/format.feature
+++ b/features/format.feature
@@ -179,3 +179,30 @@ Feature: Format
           options:
             tag: '{{.Name}}'
       """
+
+  Scenario: Sexadecimal Number Support
+    Given a file named "compose.yml" with:
+      """
+      version: "2"
+      services:
+        service:
+          image: image
+          ports:
+            - '10'
+            - '59:59'
+            - 60:60
+            - 61:61
+      """
+    When I run `bin/compose_format compose.yml`
+    Then it should pass with exactly:
+      """
+      version: '2'
+      services:
+        service:
+          image: image
+          ports:
+          - '10'
+          - '59:59'
+          - '60:60'
+          - 61:61
+      """