diff --git a/src/libfetchers/git.cc b/src/libfetchers/git.cc
index 12233ed0a..90c6ad531 100644
--- a/src/libfetchers/git.cc
+++ b/src/libfetchers/git.cc
@@ -9,7 +9,7 @@
 #include "processes.hh"
 #include "git.hh"
 #include "fs-input-accessor.hh"
-#include "union-input-accessor.hh"
+#include "mounted-input-accessor.hh"
 #include "git-utils.hh"
 
 #include "fetch-settings.hh"
@@ -587,7 +587,7 @@ struct GitInputScheme : InputScheme
 
         auto accessor = repo->getAccessor(rev);
 
-        /* If the repo has submodules, fetch them and return a union
+        /* If the repo has submodules, fetch them and return a mounted
            input accessor consisting of the accessor for the top-level
            repo and the accessors for the submodules. */
         if (repoInfo.submodules) {
@@ -611,7 +611,7 @@ struct GitInputScheme : InputScheme
 
             if (!mounts.empty()) {
                 mounts.insert_or_assign(CanonPath::root, accessor);
-                accessor = makeUnionInputAccessor(std::move(mounts));
+                accessor = makeMountedInputAccessor(std::move(mounts));
             }
         }
 
@@ -636,7 +636,7 @@ struct GitInputScheme : InputScheme
         ref<InputAccessor> accessor =
             makeFSInputAccessor(CanonPath(repoInfo.url), repoInfo.workdirInfo.files, makeNotAllowedError(repoInfo.url));
 
-        /* If the repo has submodules, return a union input accessor
+        /* If the repo has submodules, return a mounted input accessor
            consisting of the accessor for the top-level repo and the
            accessors for the submodule workdirs. */
         if (repoInfo.submodules && !repoInfo.workdirInfo.submodules.empty()) {
@@ -660,7 +660,7 @@ struct GitInputScheme : InputScheme
             }
 
             mounts.insert_or_assign(CanonPath::root, accessor);
-            accessor = makeUnionInputAccessor(std::move(mounts));
+            accessor = makeMountedInputAccessor(std::move(mounts));
         }
 
         if (!repoInfo.workdirInfo.isDirty) {
diff --git a/src/libfetchers/union-input-accessor.cc b/src/libfetchers/mounted-input-accessor.cc
similarity index 86%
rename from src/libfetchers/union-input-accessor.cc
rename to src/libfetchers/mounted-input-accessor.cc
index f9472efa7..49917f6e5 100644
--- a/src/libfetchers/union-input-accessor.cc
+++ b/src/libfetchers/mounted-input-accessor.cc
@@ -1,12 +1,12 @@
-#include "union-input-accessor.hh"
+#include "mounted-input-accessor.hh"
 
 namespace nix {
 
-struct UnionInputAccessor : InputAccessor
+struct MountedInputAccessor : InputAccessor
 {
     std::map<CanonPath, ref<InputAccessor>> mounts;
 
-    UnionInputAccessor(std::map<CanonPath, ref<InputAccessor>> _mounts)
+    MountedInputAccessor(std::map<CanonPath, ref<InputAccessor>> _mounts)
         : mounts(std::move(_mounts))
     {
         // Currently we require a root filesystem. This could be relaxed.
@@ -71,9 +71,9 @@ struct UnionInputAccessor : InputAccessor
     }
 };
 
-ref<InputAccessor> makeUnionInputAccessor(std::map<CanonPath, ref<InputAccessor>> mounts)
+ref<InputAccessor> makeMountedInputAccessor(std::map<CanonPath, ref<InputAccessor>> mounts)
 {
-    return make_ref<UnionInputAccessor>(std::move(mounts));
+    return make_ref<MountedInputAccessor>(std::move(mounts));
 }
 
 }
diff --git a/src/libfetchers/mounted-input-accessor.hh b/src/libfetchers/mounted-input-accessor.hh
new file mode 100644
index 000000000..b557c5dad
--- /dev/null
+++ b/src/libfetchers/mounted-input-accessor.hh
@@ -0,0 +1,9 @@
+#pragma once
+
+#include "input-accessor.hh"
+
+namespace nix {
+
+ref<InputAccessor> makeMountedInputAccessor(std::map<CanonPath, ref<InputAccessor>> mounts);
+
+}
diff --git a/src/libfetchers/union-input-accessor.hh b/src/libfetchers/union-input-accessor.hh
deleted file mode 100644
index 6a1649c1d..000000000
--- a/src/libfetchers/union-input-accessor.hh
+++ /dev/null
@@ -1,9 +0,0 @@
-#pragma once
-
-#include "input-accessor.hh"
-
-namespace nix {
-
-ref<InputAccessor> makeUnionInputAccessor(std::map<CanonPath, ref<InputAccessor>> mounts);
-
-}