diff --git a/src/display_manager.c b/src/display_manager.c
index 4f9da149..4ac0b630 100644
--- a/src/display_manager.c
+++ b/src/display_manager.c
@@ -124,6 +124,7 @@ CFStringRef display_manager_arrangement_display_uuid(int arrangement)
             CFMutableArrayRef mut_displays = CFArrayCreateMutableCopy(NULL, count, displays);
             CFArraySortValues(mut_displays, all, &coordinate_comparator, NULL);
             result = CFArrayGetValueAtIndex(mut_displays, index);
+            CFRelease(mut_displays);
         }
     }