diff --git a/src/physfs.c b/src/physfs.c
index 9498a9b..f57837e 100644
--- a/src/physfs.c
+++ b/src/physfs.c
@@ -657,7 +657,8 @@ void __PHYSFS_sort(void *entries, size_t max,
      * Quicksort w/ Bubblesort fallback algorithm inspired by code from here:
      *   http://www.cs.ubc.ca/spider/harrison/Java/sorting-demo.html
      */
-    __PHYSFS_quick_sort(entries, 0, max - 1, cmpfn, swapfn);
+    if (max > 0)
+        __PHYSFS_quick_sort(entries, 0, max - 1, cmpfn, swapfn);
 } /* __PHYSFS_sort */