Index: aoc.c
==================================================================
--- aoc.c
+++ aoc.c
@@ -36,10 +36,10 @@
     // read data from dataname into input
     char *input = NULL;
     size_t ilen = slurp(&input, dataname);
 
     // call the right function
-    void (*p)(char *, size_t) = aocselect(y, d);
+    aocfunc *p = aocselect(y, d);
     if (p) p(input, ilen);
     else fprintf(stderr, "Impossible!\n");
     free(input);
 }