diff --git a/src/generation.rs b/src/generation.rs
index d785fcc..5ba1388 100644
--- a/src/generation.rs
+++ b/src/generation.rs
@@ -509,6 +509,11 @@ impl GenerationScope {
             if let AliasIdent::Rust(ident) = alias_ident {
                 // also make sure not to generate it if we instead generated a binary wrapper type
                 if alias_info.gen_rust_alias {
+                    if let ConceptualRustType::Fixed(_) =
+                        &alias_info.base_type.conceptual_type
+                    {
+                        continue;
+                    }
                     self.rust(types, ident).push_type_alias(
                         TypeAlias::new(
                             ident,
diff --git a/tests/canonical/input.cddl b/tests/canonical/input.cddl
index 9de38c5..ca6cc9b 100644
--- a/tests/canonical/input.cddl
+++ b/tests/canonical/input.cddl
@@ -1,3 +1,5 @@
+constant10 = 10
+
 foo = #6.11([uint, text, bytes])
 
 bar = {