diff --git a/src/librustc_lint/error_codes.rs b/src/librustc_lint/error_codes.rs
index 3165673111cc..d7c39b780bfd 100644
--- a/src/librustc_lint/error_codes.rs
+++ b/src/librustc_lint/error_codes.rs
@@ -1,4 +1,4 @@
-use syntax::{register_diagnostic, register_diagnostics};
+use syntax::register_diagnostics;
 
 register_diagnostics! {
     E0721, // `await` keyword
diff --git a/src/librustc_metadata/error_codes.rs b/src/librustc_metadata/error_codes.rs
index 9ac582ebc42d..7c6317365913 100644
--- a/src/librustc_metadata/error_codes.rs
+++ b/src/librustc_metadata/error_codes.rs
@@ -1,6 +1,6 @@
 #![allow(non_snake_case)]
 
-use syntax::{register_diagnostic, register_diagnostics, register_long_diagnostics};
+use syntax::{register_diagnostics, register_long_diagnostics};
 
 register_long_diagnostics! {
 E0454: r##"
diff --git a/src/librustc_passes/error_codes.rs b/src/librustc_passes/error_codes.rs
index e3c6b16703a4..36ebe5cf455f 100644
--- a/src/librustc_passes/error_codes.rs
+++ b/src/librustc_passes/error_codes.rs
@@ -1,6 +1,6 @@
 #![allow(non_snake_case)]
 
-use syntax::{register_diagnostic, register_diagnostics, register_long_diagnostics};
+use syntax::{register_diagnostics, register_long_diagnostics};
 
 register_long_diagnostics! {
 /*
diff --git a/src/librustc_plugin/error_codes.rs b/src/librustc_plugin/error_codes.rs
index 68462bd83ef6..9e76f52a111b 100644
--- a/src/librustc_plugin/error_codes.rs
+++ b/src/librustc_plugin/error_codes.rs
@@ -1,6 +1,6 @@
 #![allow(non_snake_case)]
 
-use syntax::{register_diagnostic, register_diagnostics, register_long_diagnostics};
+use syntax::{register_diagnostics, register_long_diagnostics};
 
 register_long_diagnostics! {
 
diff --git a/src/librustc_resolve/error_codes.rs b/src/librustc_resolve/error_codes.rs
index 7cd26dce1447..15194a5d1463 100644
--- a/src/librustc_resolve/error_codes.rs
+++ b/src/librustc_resolve/error_codes.rs
@@ -1,6 +1,6 @@
 #![allow(non_snake_case)]
 
-use syntax::{register_diagnostic, register_diagnostics, register_long_diagnostics};
+use syntax::{register_diagnostics, register_long_diagnostics};
 
 // Error messages for EXXXX errors.  Each message should start and end with a
 // new line, and be wrapped to 80 characters.  In vim you can `:set tw=80` and
diff --git a/src/libsyntax/diagnostics/macros.rs b/src/libsyntax/diagnostics/macros.rs
index 6f7493ad5972..b754d0833761 100644
--- a/src/libsyntax/diagnostics/macros.rs
+++ b/src/libsyntax/diagnostics/macros.rs
@@ -170,19 +170,19 @@ macro_rules! help {
 #[macro_export]
 macro_rules! register_diagnostics {
     ($($code:tt),*) => (
-        $(register_diagnostic! { $code })*
+        $($crate::register_diagnostic! { $code })*
     );
     ($($code:tt),*,) => (
-        $(register_diagnostic! { $code })*
+        $($crate::register_diagnostic! { $code })*
     )
 }
 
 #[macro_export]
 macro_rules! register_long_diagnostics {
     ($($code:tt: $description:tt),*) => (
-        $(register_diagnostic! { $code, $description })*
+        $($crate::register_diagnostic! { $code, $description })*
     );
     ($($code:tt: $description:tt),*,) => (
-        $(register_diagnostic! { $code, $description })*
+        $($crate::register_diagnostic! { $code, $description })*
     )
 }
diff --git a/src/libsyntax_ext/error_codes.rs b/src/libsyntax_ext/error_codes.rs
index 9bbd9fdec17d..9ec551b43952 100644
--- a/src/libsyntax_ext/error_codes.rs
+++ b/src/libsyntax_ext/error_codes.rs
@@ -1,6 +1,6 @@
 #![allow(non_snake_case)]
 
-use syntax::{register_diagnostic, register_long_diagnostics};
+use syntax::register_long_diagnostics;
 
 // Error messages for EXXXX errors.
 // Each message should start and end with a new line, and be wrapped to 80 characters.