diff --git a/Cargo.toml b/Cargo.toml
index 767d52908..c5cdf57f5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -162,7 +162,7 @@ passfd = "0.1.6"
 percent-encoding = "2.3"
 pest = "2.7"
 pest_derive = "2.7"
-phf = "0.11"
+phf = {version="0.11", default-features=false}
 phf_codegen = "0.10"
 pkg-config = "0.3"
 plist = "1.7"
@@ -221,7 +221,7 @@ time-funcs = { path = "lua-api-crates/time-funcs" }
 tiny-skia = "0.11"
 tokio = "1.43"
 toml = "0.8"
-ucd-trie = "0.1"
+ucd-trie = {version="0.1", default-features=false}
 uds_windows = "1.1"
 umask = { path = "umask" }
 unicode-normalization = "0.1.24"
diff --git a/wezterm-char-props/Cargo.toml b/wezterm-char-props/Cargo.toml
index c456544fd..5669400ec 100644
--- a/wezterm-char-props/Cargo.toml
+++ b/wezterm-char-props/Cargo.toml
@@ -16,6 +16,8 @@ serde = {workspace=true, optional=true}
 ucd-trie.workspace = true
 
 [features]
+default = ["std"]
+std = ["serde/std", "ucd-trie/std", "phf/std"]
 use_serde = ["serde"]
 
 [dev-dependencies]
diff --git a/wezterm-char-props/src/lib.rs b/wezterm-char-props/src/lib.rs
index 42c794120..e0960a49c 100644
--- a/wezterm-char-props/src/lib.rs
+++ b/wezterm-char-props/src/lib.rs
@@ -1,3 +1,4 @@
+#![cfg_attr(not(feature = "std"), no_std)]
 pub mod emoji;
 pub mod emoji_presentation;
 pub mod emoji_variation;
diff --git a/wezterm-char-props/src/nerdfonts.rs b/wezterm-char-props/src/nerdfonts.rs
index 585a92f6c..a5a168a9a 100644
--- a/wezterm-char-props/src/nerdfonts.rs
+++ b/wezterm-char-props/src/nerdfonts.rs
@@ -1,10 +1,14 @@
+#[cfg(feature = "std")]
 use std::collections::HashMap;
+#[cfg(feature = "std")]
 use std::sync::LazyLock;
 
+#[cfg(feature = "std")]
 pub static NERD_FONTS: LazyLock<HashMap<&'static str, char>> = LazyLock::new(build_map);
 
 pub use crate::nerdfonts_data::NERD_FONT_GLYPHS;
 
+#[cfg(feature = "std")]
 fn build_map() -> HashMap<&'static str, char> {
     crate::nerdfonts_data::NERD_FONT_GLYPHS
         .iter()
diff --git a/wezterm-char-props/src/widechar_width.rs b/wezterm-char-props/src/widechar_width.rs
index 17ab41cd9..0aaf34ef5 100644
--- a/wezterm-char-props/src/widechar_width.rs
+++ b/wezterm-char-props/src/widechar_width.rs
@@ -1515,7 +1515,7 @@ const WIDENED_TABLE: &'static [R] = &[
 fn in_table(arr: &[R], c: u32) -> bool {
     arr.binary_search_by(|(start, end)| {
         if c >= *start && c <= *end {
-            std::cmp::Ordering::Equal
+            core::cmp::Ordering::Equal
         } else {
             start.cmp(&c)
         }