--- a/src/gtkcompletionline.cc
+++ b/src/gtkcompletionline.cc
@@ -376,7 +377,7 @@
   return 0;
 }
 
-int my_alphasort(const void* va, const void* vb) {
+int my_alphasort(const dirent** va, const dirent** vb) {
   const struct dirent** a = (const struct dirent**)va;
   const struct dirent** b = (const struct dirent**)vb;