diff --git a/compiler/rustc_metadata/src/creader.rs b/compiler/rustc_metadata/src/creader.rs
index 4e3921e83de7..e65c7a684260 100644
--- a/compiler/rustc_metadata/src/creader.rs
+++ b/compiler/rustc_metadata/src/creader.rs
@@ -24,8 +24,7 @@ use rustc_middle::ty::data_structures::IndexSet;
 use rustc_middle::ty::{TyCtxt, TyCtxtFeed};
 use rustc_proc_macro::bridge::client::ProcMacro;
 use rustc_session::config::{
-    self, CrateType, ExtendedTargetModifierInfo, ExternLocation, OptionsTargetModifiers,
-    TargetModifier,
+    CrateType, ExtendedTargetModifierInfo, ExternLocation, OptionsTargetModifiers, TargetModifier,
 };
 use rustc_session::cstore::{CrateDepKind, CrateSource, ExternCrate, ExternCrateSource};
 use rustc_session::lint::{self, BuiltinLintDiag};
@@ -33,7 +32,7 @@ use rustc_session::output::validate_crate_name;
 use rustc_session::search_paths::PathKind;
 use rustc_span::edition::Edition;
 use rustc_span::{DUMMY_SP, Ident, Span, Symbol, sym};
-use rustc_target::spec::{PanicStrategy, Target, TargetTuple};
+use rustc_target::spec::{PanicStrategy, Target};
 use tracing::{debug, info, trace};
 
 use crate::errors;
@@ -697,7 +696,7 @@ impl<'a, 'tcx> CrateLoader<'a, 'tcx> {
             let mut proc_macro_locator = locator.clone();
 
             // Try to load a proc macro
-            proc_macro_locator.is_proc_macro = true;
+            proc_macro_locator.for_target_proc_macro(self.sess, path_kind);
 
             // Load the proc macro crate for the target
             let target_result =
@@ -709,17 +708,12 @@ impl<'a, 'tcx> CrateLoader<'a, 'tcx> {
                     None => return Ok(None),
                 };
 
-            // Load the proc macro crate for the host
-
             // Use the existing crate_rejections as we want the error message to be affected by
             // loading the host proc macro.
             *crate_rejections = CrateRejections::default();
-            // FIXME use a separate CrateLocator for the host rather than mutating the target CrateLocator
-            locator.is_proc_macro = true;
-            locator.target = &self.sess.host;
-            locator.tuple = TargetTuple::from_tuple(config::host_tuple());
-            locator.filesearch = self.sess.host_filesearch();
-            locator.path_kind = path_kind;
+
+            // Load the proc macro crate for the host
+            locator.for_proc_macro(self.sess, path_kind);
 
             locator.hash = host_hash;
 
@@ -739,16 +733,8 @@ impl<'a, 'tcx> CrateLoader<'a, 'tcx> {
             // affect the error message we emit
             let mut proc_macro_locator = locator.clone();
 
-            // Try to load a proc macro
-            proc_macro_locator.is_proc_macro = true;
-
             // Load the proc macro crate for the host
-
-            // FIXME use a separate CrateLocator for the host rather than mutating the target CrateLocator
-            proc_macro_locator.target = &self.sess.host;
-            proc_macro_locator.tuple = TargetTuple::from_tuple(config::host_tuple());
-            proc_macro_locator.filesearch = self.sess.host_filesearch();
-            proc_macro_locator.path_kind = path_kind;
+            proc_macro_locator.for_proc_macro(self.sess, path_kind);
 
             let Some(host_result) =
                 self.load(&mut proc_macro_locator, &mut CrateRejections::default())?
diff --git a/compiler/rustc_metadata/src/locator.rs b/compiler/rustc_metadata/src/locator.rs
index 2578526e4686..36ce93737e89 100644
--- a/compiler/rustc_metadata/src/locator.rs
+++ b/compiler/rustc_metadata/src/locator.rs
@@ -224,11 +224,11 @@ use rustc_data_structures::owned_slice::{OwnedSlice, slice_owned};
 use rustc_data_structures::svh::Svh;
 use rustc_errors::{DiagArgValue, IntoDiagArg};
 use rustc_fs_util::try_canonicalize;
-use rustc_session::Session;
 use rustc_session::cstore::CrateSource;
 use rustc_session::filesearch::FileSearch;
 use rustc_session::search_paths::PathKind;
 use rustc_session::utils::CanonicalizedPath;
+use rustc_session::{Session, config};
 use rustc_span::{Span, Symbol};
 use rustc_target::spec::{Target, TargetTuple};
 use tempfile::Builder as TempFileBuilder;
@@ -251,11 +251,11 @@ pub(crate) struct CrateLocator<'a> {
     exact_paths: Vec<CanonicalizedPath>,
     pub hash: Option<Svh>,
     extra_filename: Option<&'a str>,
-    pub target: &'a Target,
-    pub tuple: TargetTuple,
-    pub filesearch: &'a FileSearch,
-    pub is_proc_macro: bool,
-    pub path_kind: PathKind,
+    target: &'a Target,
+    tuple: TargetTuple,
+    filesearch: &'a FileSearch,
+    is_proc_macro: bool,
+    path_kind: PathKind,
 }
 
 #[derive(Clone, Debug)]
@@ -346,6 +346,22 @@ impl<'a> CrateLocator<'a> {
         }
     }
 
+    pub(crate) fn for_proc_macro(&mut self, sess: &'a Session, path_kind: PathKind) {
+        self.is_proc_macro = true;
+        self.target = &sess.host;
+        self.tuple = TargetTuple::from_tuple(config::host_tuple());
+        self.filesearch = sess.host_filesearch();
+        self.path_kind = path_kind;
+    }
+
+    pub(crate) fn for_target_proc_macro(&mut self, sess: &'a Session, path_kind: PathKind) {
+        self.is_proc_macro = true;
+        self.target = &sess.target;
+        self.tuple = sess.opts.target_triple.clone();
+        self.filesearch = sess.target_filesearch();
+        self.path_kind = path_kind;
+    }
+
     pub(crate) fn maybe_load_library_crate(
         &self,
         crate_rejections: &mut CrateRejections,