diff --git a/compiler/gen_llvm/src/llvm/build.rs b/compiler/gen_llvm/src/llvm/build.rs
index d1ac16f525..3585dcde7c 100644
--- a/compiler/gen_llvm/src/llvm/build.rs
+++ b/compiler/gen_llvm/src/llvm/build.rs
@@ -204,12 +204,17 @@ impl<'a, 'ctx, 'env> Env<'a, 'ctx, 'env> {
         }
     }
 
-    /// The integer type representing a RocList or RocStr when following the C ABI
+    /// The integer type representing twice the width of a pointer
     ///
     /// on 64-bit systems, this is i128
     /// on 32-bit systems, this is i64
-    pub fn str_list_c_abi(&self) -> IntType<'ctx> {
-        crate::llvm::convert::str_list_int(self.context, self.target_info)
+    pub fn twice_ptr_int(&self) -> IntType<'ctx> {
+        let ctx = self.context;
+
+        match self.target_info.ptr_width() {
+            roc_target::PtrWidth::Bytes4 => ctx.i64_type(),
+            roc_target::PtrWidth::Bytes8 => ctx.i128_type(),
+        }
     }
 
     pub fn small_str_bytes(&self) -> u32 {
diff --git a/compiler/gen_llvm/src/llvm/build_str.rs b/compiler/gen_llvm/src/llvm/build_str.rs
index 2bd5014986..fb4a2c8c8d 100644
--- a/compiler/gen_llvm/src/llvm/build_str.rs
+++ b/compiler/gen_llvm/src/llvm/build_str.rs
@@ -359,7 +359,7 @@ pub fn str_from_utf8_range<'a, 'ctx, 'env>(
             complex_bitcast(
                 env.builder,
                 count_and_start.into(),
-                env.str_list_c_abi().into(),
+                env.twice_ptr_int().into(),
                 "to_i128",
             ),
             result_ptr.into(),