diff --git a/plugins/zynaddsubfx/fltk/src/filename_list.cxx b/plugins/zynaddsubfx/fltk/src/filename_list.cxx
index ea7ab98cb..2791ac0ce 100644
--- a/plugins/zynaddsubfx/fltk/src/filename_list.cxx
+++ b/plugins/zynaddsubfx/fltk/src/filename_list.cxx
@@ -77,7 +77,7 @@ int fl_filename_list(const char *d, dirent ***list,
                      Fl_File_Sort_F *sort) {
 #ifndef HAVE_SCANDIR
   int n = scandir(d, list, 0, sort);
-#elif defined(__hpux) || defined(__CYGWIN__)
+#elif defined(__hpux) || defined(__CYGWIN__) || (__GLIBC__ >= 2 && __GLIBC_MINOR__ >= 10 )
   // HP-UX, Cygwin define the comparison function like this:
   int n = scandir(d, list, 0, (int(*)(const dirent **, const dirent **))sort);
 #elif defined(__osf__)