Index: uspace/lib/libc/include/assert.h
===================================================================
--- uspace/lib/libc/include/assert.h	(revision 3e56ab9b9b680797a6f89d852af5a8af05281d56)
+++ uspace/lib/libc/include/assert.h	(revision 89cb1402392f2b9bc19e07a45fb935eaf0be3e0f)
@@ -47,5 +47,7 @@
  */
 
+#include <stdio.h>
 #include <stdlib.h>
+
 #ifndef NDEBUG
 #	define assert(expr) if (!(expr)) { printf("Assertion failed (%s) at file '%s', line %d.\n", #expr, __FILE__, __LINE__); abort();}