diff --git a/src/render.rs b/src/render.rs
index e8d5a86..0ea793f 100644
--- a/src/render.rs
+++ b/src/render.rs
@@ -1,5 +1,8 @@
 //! Helpers for rendering buffers and editors
 
+#[cfg(not(feature = "std"))]
+use core_maths::CoreFloat;
+
 use crate::{Color, LayoutGlyph, LayoutRun, PhysicalGlyph, UnderlineStyle};
 #[cfg(feature = "swash")]
 use crate::{FontSystem, SwashCache};
diff --git a/src/shape.rs b/src/shape.rs
index dac720a..850eb47 100644
--- a/src/shape.rs
+++ b/src/shape.rs
@@ -9,7 +9,7 @@ use crate::{
     Metrics, Wrap,
 };
 #[cfg(not(feature = "std"))]
-use alloc::{format, vec, vec::Vec};
+use alloc::{boxed::Box, format, vec, vec::Vec};
 
 use alloc::collections::VecDeque;
 use core::cmp::{max, min};