diff --git a/kern/libkern/assert.h b/kern/libkern/assert.h
index 7cb7a27..3489342 100644
--- a/kern/libkern/assert.h
+++ b/kern/libkern/assert.h
@@ -1,4 +1,5 @@
 #include <panic.h>
+#include <stdio.h>
 
 #define assert(cond)                                                                                                   \
     do {                                                                                                               \