diff --git a/src/packages/string_more.rs b/src/packages/string_more.rs
index e19bdbc6..9b185ec6 100644
--- a/src/packages/string_more.rs
+++ b/src/packages/string_more.rs
@@ -44,8 +44,6 @@ macro_rules! reg_functions {
 
 def_package!(crate:MoreStringPackage:"Additional string utilities, including string building.", lib, {
     reg_functions!(lib += basic; INT, bool, char, FnPtr);
-    set_exported_fn!(lib, "+", string_funcs::append_unit);
-    set_exported_fn!(lib, "+", string_funcs::prepend_unit);
 
     #[cfg(not(feature = "only_i32"))]
     #[cfg(not(feature = "only_i64"))]
@@ -61,8 +59,8 @@ def_package!(crate:MoreStringPackage:"Additional string utilities, including str
 
     #[cfg(not(feature = "no_index"))]
     {
-        set_exported_fn!(lib, "+", string_funcs::append_array);
-        set_exported_fn!(lib, "+", string_funcs::prepend_array);
+        set_exported_fn!(lib, "+", string_funcs_array::append_array);
+        set_exported_fn!(lib, "+", string_funcs_array::prepend_array);
     }
 
     lib.combine(exported_module!(string_functions));
@@ -189,8 +187,23 @@ mod string_functions {
     }
 }
 
-mod string_funcs {
+#[cfg(not(feature = "no_index"))]
+mod string_funcs_array {
     use crate::engine::Array;
+    use crate::plugin::*;
+    use crate::utils::ImmutableString;
+
+    #[export_fn]
+    pub fn append_array(x: &mut ImmutableString, y: Array) -> String {
+        format!("{}{:?}", x, y)
+    }
+    #[export_fn]
+    pub fn prepend_array(x: &mut Array, y: ImmutableString) -> String {
+        format!("{:?}{}", x, y)
+    }
+}
+
+mod string_funcs {
     use crate::parser::INT;
     use crate::plugin::*;
     use crate::utils::{ImmutableString, StaticVec};
@@ -204,14 +217,6 @@ mod string_funcs {
         s
     }
     #[export_fn]
-    pub fn append_array(x: &mut ImmutableString, y: Array) -> String {
-        format!("{}{:?}", x, y)
-    }
-    #[export_fn]
-    pub fn prepend_array(x: &mut Array, y: ImmutableString) -> String {
-        format!("{:?}{}", x, y)
-    }
-    #[export_fn]
     pub fn len(s: &mut ImmutableString) -> INT {
         s.chars().count() as INT
     }