diff --git a/08/p3.c b/08/p3.c
index 71791d7..091ed9d 100644
--- a/08/p3.c
+++ b/08/p3.c
@@ -3,6 +3,7 @@
 #include <unistd.h>
 #include <string.h>
 #include <sys/wait.h>
+#include <assert.h>
 
 int
 main(int argc, char *argv[])