diff --git a/nac3core/src/codegen/irrt/classes.rs b/nac3core/src/codegen/irrt/classes.rs
index b3f19339..520ba316 100644
--- a/nac3core/src/codegen/irrt/classes.rs
+++ b/nac3core/src/codegen/irrt/classes.rs
@@ -75,33 +75,6 @@ impl<'ctx> Address<'ctx, NpArrayLens<'ctx>> {
     }
 }
 
-pub struct IrrtStringFields<'ctx> {
-    pub buffer: GepGetter<AddressLens<IntLens<'ctx>>>,
-    pub capacity: GepGetter<IntLens<'ctx>>,
-    pub cursor: GepGetter<IntLens<'ctx>>,
-}
-
-#[derive(Debug, Clone, Copy)]
-pub struct IrrtStringLens;
-
-impl<'ctx> StructureOptic<'ctx> for IrrtStringLens {
-    type Fields = IrrtStringFields<'ctx>;
-
-    fn struct_name(&self) -> &'static str {
-        "String"
-    }
-
-    fn build_fields(&self, builder: &mut FieldBuilder<'ctx>) -> Self::Fields {
-        let llvm_i8 = builder.ctx.i8_type();
-        let llvm_i32 = builder.ctx.i32_type();
-        IrrtStringFields {
-            buffer: builder.add_field("buffer", AddressLens(IntLens(llvm_i8))),
-            capacity: builder.add_field("capacity", IntLens(llvm_i32)),
-            cursor: builder.add_field("cursor", IntLens(llvm_i32)),
-        }
-    }
-}
-
 pub struct ErrorIdsFields<'ctx> {
     pub index_error: GepGetter<IntLens<'ctx>>,
     pub value_error: GepGetter<IntLens<'ctx>>,