diff --git a/compiler/rustc_codegen_ssa/src/base.rs b/compiler/rustc_codegen_ssa/src/base.rs
index d11f1534153ad..b97cdb53fe450 100644
--- a/compiler/rustc_codegen_ssa/src/base.rs
+++ b/compiler/rustc_codegen_ssa/src/base.rs
@@ -451,12 +451,12 @@ pub fn maybe_create_entry_wrapper<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
                 .unwrap()
                 .unwrap(),
             );
-            let start_ty = cx.type_func(&[cx.val_ty(rust_main), isize_ty, i8pp_ty], isize_ty);
-            (start_fn, start_ty, vec![rust_main, arg_argc, arg_argv])
+            let start_ty = cx.type_func(&[cx.val_ty(rust_main), i8pp_ty, isize_ty], isize_ty);
+            (start_fn, start_ty, vec![rust_main, arg_argv, arg_argc])
         } else {
             debug!("using user-defined start fn");
-            let start_ty = cx.type_func(&[isize_ty, i8pp_ty], isize_ty);
-            (rust_main, start_ty, vec![arg_argc, arg_argv])
+            let start_ty = cx.type_func(&[i8pp_ty, isize_ty], isize_ty);
+            (rust_main, start_ty, vec![arg_argv, arg_argc])
         };
 
         let result = bx.call(start_ty, start_fn, &args, None);
diff --git a/library/std/src/rt.rs b/library/std/src/rt.rs
index 663537a05fa32..f184bc0e31490 100644
--- a/library/std/src/rt.rs
+++ b/library/std/src/rt.rs
@@ -138,8 +138,8 @@ fn lang_start_internal(
 #[lang = "start"]
 fn lang_start<T: crate::process::Termination + 'static>(
     main: fn() -> T,
-    argc: isize,
     argv: *const *const u8,
+    argc: isize,
 ) -> isize {
     let Ok(v) = lang_start_internal(
         &move || crate::sys_common::backtrace::__rust_begin_short_backtrace(main).report().to_i32(),