Index: uspace/lib/c/include/adt/hash.h
===================================================================
--- uspace/lib/c/include/adt/hash.h	(revision 8d2dd7f2d52fbc7693f94b66e451eeff3756d061)
+++ uspace/lib/c/include/adt/hash.h	(revision 7367c312a2e6aa20171463840a60416c6f2d046c)
@@ -36,4 +36,5 @@
 
 #include <stdint.h>
+#include <sys/types.h>
 
 /** Produces a uniform hash affecting all output bits from the skewed input. */