diff --git a/rustler_codegen/src/context.rs b/rustler_codegen/src/context.rs
index 5df63e5c..a9a62e1a 100644
--- a/rustler_codegen/src/context.rs
+++ b/rustler_codegen/src/context.rs
@@ -126,7 +126,7 @@ impl<'a> Context<'a> {
     pub fn escape_ident_with_index(ident_str: &str, index: usize, infix: &str) -> Ident {
         Ident::new(
             &format!(
-                "RUSTLER_{}_field_{}_{}",
+                "rustler_{}_field_{}_{}",
                 infix,
                 index,
                 Self::remove_raw(ident_str)
@@ -137,7 +137,7 @@ impl<'a> Context<'a> {
 
     pub fn escape_ident(ident_str: &str, infix: &str) -> Ident {
         Ident::new(
-            &format!("RUSTLER_{}_field_{}", infix, Self::remove_raw(ident_str)),
+            &format!("rustler_{}_field_{}", infix, Self::remove_raw(ident_str)),
             Span::call_site(),
         )
     }