diff --git a/nac3core/src/codegen/irrt/string.rs b/nac3core/src/codegen/irrt/string.rs
index 039c7273..fb0f27b9 100644
--- a/nac3core/src/codegen/irrt/string.rs
+++ b/nac3core/src/codegen/irrt/string.rs
@@ -1,7 +1,7 @@
 use inkwell::values::{BasicValueEnum, CallSiteValue, IntValue, PointerValue};
 use itertools::Either;
 
-use crate::codegen::{CodeGenContext, CodeGenerator};
+use crate::codegen::{macros::codegen_unreachable, CodeGenContext, CodeGenerator};
 
 /// Generates a call to string equality comparison. Returns an `i1` representing whether the strings are equal.
 pub fn call_string_eq<'ctx, G: CodeGenerator + ?Sized>(
@@ -12,10 +12,16 @@ pub fn call_string_eq<'ctx, G: CodeGenerator + ?Sized>(
     str2_ptr: PointerValue<'ctx>,
     str2_len: IntValue<'ctx>,
 ) -> IntValue<'ctx> {
-    let func = ctx.module.get_function("nac3_str_eq").unwrap_or_else(|| {
+    let (func_name, return_type) = match ctx.ctx.i32_type().get_bit_width() {
+        32 => ("nac3_str_eq", ctx.ctx.i32_type()),
+        64 => ("nac3_str_eq64", ctx.ctx.i64_type()),
+        bw => codegen_unreachable!(ctx, "Unsupported size type bit width: {}", bw),
+    };
+
+    let func = ctx.module.get_function(func_name).unwrap_or_else(|| {
         ctx.module.add_function(
-            "nac3_str_eq",
-            ctx.ctx.i32_type().fn_type(
+            func_name,
+            return_type.fn_type(
                 &[
                     str1_ptr.get_type().into(),
                     str1_len.get_type().into(),