diff --git a/nac3core/src/toplevel/builtins.rs b/nac3core/src/toplevel/builtins.rs
index f4a99ae3..0007286c 100644
--- a/nac3core/src/toplevel/builtins.rs
+++ b/nac3core/src/toplevel/builtins.rs
@@ -255,9 +255,7 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
                     let arg_ty = fun.0.args[0].ty;
                     let arg = args[0].1.clone().to_basic_value_enum(ctx, generator)?;
                     Ok(
-                        if ctx.unifier.unioned(arg_ty, boolean)
-                            || ctx.unifier.unioned(arg_ty, int32)
-                        {
+                        if ctx.unifier.unioned(arg_ty, boolean) {
                             Some(
                                 ctx.builder
                                     .build_int_z_extend(
@@ -267,6 +265,16 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
                                     )
                                     .into(),
                             )
+                        } else if ctx.unifier.unioned(arg_ty, int32) {
+                            Some(
+                                ctx.builder
+                                    .build_int_s_extend(
+                                        arg.into_int_value(),
+                                        ctx.ctx.i64_type(),
+                                        "sext",
+                                    )
+                                    .into(),
+                            )
                         } else if ctx.unifier.unioned(arg_ty, int64) {
                             Some(arg)
                         } else if ctx.unifier.unioned(arg_ty, float) {