--- src/fcdir.c
+++ src/fcdir.c
@@ -265,7 +265,7 @@
     /*
      * Sort files to make things prettier
      */
-    qsort(files->strs, files->num, sizeof(FcChar8 *), cmpstringp);
+    if (files->num != 0) qsort(files->strs, files->num, sizeof(FcChar8 *), cmpstringp);
 
     /*
      * Scan file files to build font patterns