diff --git a/src/librustc_mir/interpret/intrinsics.rs b/src/librustc_mir/interpret/intrinsics.rs
index 0db9c7026588..b47480592625 100644
--- a/src/librustc_mir/interpret/intrinsics.rs
+++ b/src/librustc_mir/interpret/intrinsics.rs
@@ -2,6 +2,8 @@
 //! looking at their MIR. Intrinsics/functions supported here are shared by CTFE
 //! and miri.
 
+use std::convert::TryFrom;
+
 use rustc_hir::def_id::DefId;
 use rustc_middle::mir::{
     self,