diff --git a/crates/sel4-kernel-loader/add-payload/src/main.rs b/crates/sel4-kernel-loader/add-payload/src/main.rs
index 5b709f3ab..a2f44f48a 100644
--- a/crates/sel4-kernel-loader/add-payload/src/main.rs
+++ b/crates/sel4-kernel-loader/add-payload/src/main.rs
@@ -33,11 +33,18 @@ fn main() -> Result<()> {
 
     let sel4_config: Configuration =
         serde_json::from_reader(File::open(&args.sel4_config_path).unwrap()).unwrap();
-    let word_size = sel4_config.get("WORD_SIZE").unwrap().as_string().unwrap();
+
+    let word_size = sel4_config
+        .get("WORD_SIZE")
+        .unwrap()
+        .as_str()
+        .unwrap()
+        .parse::<usize>()
+        .unwrap();
 
     match word_size {
-        "32" => continue_with_word_size::<FileHeader32<Endianness>>(&args),
-        "64" => continue_with_word_size::<FileHeader64<Endianness>>(&args),
+        32 => continue_with_word_size::<FileHeader32<Endianness>>(&args),
+        64 => continue_with_word_size::<FileHeader64<Endianness>>(&args),
         _ => {
             panic!()
         }
diff --git a/crates/sel4/config/generic/macro-impls/src/lib.rs b/crates/sel4/config/generic/macro-impls/src/lib.rs
index fcd500793..7db27d894 100644
--- a/crates/sel4/config/generic/macro-impls/src/lib.rs
+++ b/crates/sel4/config/generic/macro-impls/src/lib.rs
@@ -27,7 +27,7 @@ impl<'a> Impls<'a> {
         }
     }
 
-    fn config(&self) -> &'a Configuration {
+    pub const fn config(&self) -> &'a Configuration {
         self.config
     }
 
diff --git a/crates/sel4/config/generic/types/src/lib.rs b/crates/sel4/config/generic/types/src/lib.rs
index 9f4334358..32bff5337 100644
--- a/crates/sel4/config/generic/types/src/lib.rs
+++ b/crates/sel4/config/generic/types/src/lib.rs
@@ -62,7 +62,7 @@ impl Value {
         }
     }
 
-    pub fn as_string(&self) -> Option<&str> {
+    pub fn as_str(&self) -> Option<&str> {
         match self {
             Self::String(v) => Some(v),
             _ => None,
diff --git a/crates/sel4/config/macros/src/lib.rs b/crates/sel4/config/macros/src/lib.rs
index 9bcd4e6d5..3ade46bfb 100644
--- a/crates/sel4/config/macros/src/lib.rs
+++ b/crates/sel4/config/macros/src/lib.rs
@@ -70,3 +70,22 @@ pub fn sel4_cfg_usize(key_toks: TokenStream) -> TokenStream {
         .cfg_from_str_impl::<usize>(PhantomData, key_toks.into())
         .into()
 }
+
+#[proc_macro]
+pub fn sel4_cfg_word(key_toks: TokenStream) -> TokenStream {
+    let impls = get_impls();
+    let word_size = impls
+        .config()
+        .get("WORD_SIZE")
+        .unwrap()
+        .as_str()
+        .unwrap()
+        .parse::<usize>()
+        .unwrap();
+    let toks = match word_size {
+        32 => impls.cfg_from_str_impl::<u32>(PhantomData, key_toks.into()),
+        64 => impls.cfg_from_str_impl::<u64>(PhantomData, key_toks.into()),
+        _ => panic!(),
+    };
+    toks.into()
+}
diff --git a/crates/sel4/src/lib.rs b/crates/sel4/src/lib.rs
index 3615f6ef8..df1aab5f9 100644
--- a/crates/sel4/src/lib.rs
+++ b/crates/sel4/src/lib.rs
@@ -47,7 +47,7 @@
 
 pub use sel4_config::{
     self as config, sel4_cfg, sel4_cfg_bool, sel4_cfg_enum, sel4_cfg_if, sel4_cfg_match,
-    sel4_cfg_str, sel4_cfg_usize, sel4_cfg_wrap_match,
+    sel4_cfg_str, sel4_cfg_usize, sel4_cfg_word, sel4_cfg_wrap_match,
 };
 
 pub use sel4_sys as sys;