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-rw-r--r--src/libsyntax_ext/deriving/generic/mod.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax_ext/deriving/generic/mod.rs b/src/libsyntax_ext/deriving/generic/mod.rs
index ef7f455632c..5d4842803a0 100644
--- a/src/libsyntax_ext/deriving/generic/mod.rs
+++ b/src/libsyntax_ext/deriving/generic/mod.rs
@@ -758,7 +758,7 @@ impl<'a> TraitDef<'a> {
 
 fn find_repr_type_name(diagnostic: &Handler,
                        type_attrs: &[ast::Attribute]) -> &'static str {
-    let mut repr_type_name = "i32";
+    let mut repr_type_name = "isize";
     for a in type_attrs {
         for r in &attr::find_repr_attrs(diagnostic, a) {
             repr_type_name = match *r {