1 files changed, 1 insertions, 0 deletions
diff --git a/physics.c b/physics.c
index 5c8879d..f7fd284 100644
--- a/physics.c
+++ b/physics.c
@@ -1,5 +1,6 @@
 #include <u.h>
 #include <libc.h>
+#include <ip.h>
 #include <draw.h>
 #include "libgeometry/geometry.h"
 #include "dat.h"