diff --git a/include/lib/math.h b/include/lib/math.h
index 153ac2c6..1b27fe54 100644
--- a/include/lib/math.h
+++ b/include/lib/math.h
@@ -5,4 +5,14 @@
 
 extern "C" u32 FastDivide(u32 a, u32 b);
 
+// 20.12 fixed point number
+typedef u32 p32;
+
+typedef struct {
+    /* 0 */ p32 x;
+    /* 4 */ p32 y;
+    /* 8 */ p32 z;
+    /* c */
+} Vec3p;
+
 #endif