diff --git a/lib/differ/format/patch.rb b/lib/differ/format/patch.rb
index 2cd8e980..2aaf5e97 100644
--- a/lib/differ/format/patch.rb
+++ b/lib/differ/format/patch.rb
@@ -19,13 +19,21 @@ module Differ
         private
 
         def as_insert(change)
-          change.insert[0] = '+'
-          change.insert
+          if change.insert.start_with? ' '
+            change.insert[0] = '+'
+            change.insert
+          else
+            '+ ' + change.insert
+          end
         end
 
         def as_delete(change)
-          change.delete[0] = '-'
-          change.delete
+          if change.delete.start_with? ' '
+            change.delete[0] = '-'
+            change.delete
+          else
+            '- ' + change.delete
+          end
         end
 
         def as_change(change)