diff --git a/vendor/box2d/types.odin b/vendor/box2d/types.odin
index 1ea7cb65a..0c022fbce 100644
--- a/vendor/box2d/types.odin
+++ b/vendor/box2d/types.odin
@@ -188,6 +188,10 @@ BodyDef :: struct {
 	// Triggers whenever a shape is add/removed/changed. Default is true.
 	automaticMass: bool,
 
+	// This allows this body to bypass rotational speed limits. Should only be used
+	// for circular objects, like wheels.
+	allowFastRotation: bool,
+
 	// Used internally to detect a valid definition. DO NOT SET.
 	internalValue: i32,
 }