diff --git a/Source/cmPkgConfigResolver.cxx b/Source/cmPkgConfigResolver.cxx
index 54598c80b3..4d7ef27930 100644
--- a/Source/cmPkgConfigResolver.cxx
+++ b/Source/cmPkgConfigResolver.cxx
@@ -227,7 +227,7 @@ void cmPkgConfigResolver::ReplaceSep(std::string& list)
 }
 
 cm::optional<cmPkgConfigResult> cmPkgConfigResolver::ResolveStrict(
-  std::vector<cmPkgConfigEntry> const& entries, cmPkgConfigEnv env)
+  std::vector<cmPkgConfigEntry> const& entries, cmPkgConfigEnv& env)
 {
   cm::optional<cmPkgConfigResult> result;
   cmPkgConfigResult config;
@@ -289,11 +289,11 @@ cm::optional<cmPkgConfigResult> cmPkgConfigResolver::ResolveStrict(
 }
 
 cm::optional<cmPkgConfigResult> cmPkgConfigResolver::ResolvePermissive(
-  std::vector<cmPkgConfigEntry> const& entries, cmPkgConfigEnv env)
+  std::vector<cmPkgConfigEntry> const& entries, cmPkgConfigEnv& env)
 {
   cm::optional<cmPkgConfigResult> result;
 
-  cmPkgConfigResult config = ResolveBestEffort(entries, std::move(env));
+  cmPkgConfigResult config = ResolveBestEffort(entries, env);
   auto const& keys = config.Keywords;
 
   if (keys.find("Name") == keys.end() ||
@@ -307,7 +307,7 @@ cm::optional<cmPkgConfigResult> cmPkgConfigResolver::ResolvePermissive(
 }
 
 cmPkgConfigResult cmPkgConfigResolver::ResolveBestEffort(
-  std::vector<cmPkgConfigEntry> const& entries, cmPkgConfigEnv env)
+  std::vector<cmPkgConfigEntry> const& entries, cmPkgConfigEnv& env)
 {
   cmPkgConfigResult result;
 
diff --git a/Source/cmPkgConfigResolver.h b/Source/cmPkgConfigResolver.h
index e1d9d0a0a2..992429a3e5 100644
--- a/Source/cmPkgConfigResolver.h
+++ b/Source/cmPkgConfigResolver.h
@@ -99,13 +99,13 @@ class cmPkgConfigResolver
 
 public:
   static cm::optional<cmPkgConfigResult> ResolveStrict(
-    std::vector<cmPkgConfigEntry> const& entries, cmPkgConfigEnv env);
+    std::vector<cmPkgConfigEntry> const& entries, cmPkgConfigEnv& env);
 
   static cm::optional<cmPkgConfigResult> ResolvePermissive(
-    std::vector<cmPkgConfigEntry> const& entries, cmPkgConfigEnv env);
+    std::vector<cmPkgConfigEntry> const& entries, cmPkgConfigEnv& env);
 
   static cmPkgConfigResult ResolveBestEffort(
-    std::vector<cmPkgConfigEntry> const& entries, cmPkgConfigEnv env);
+    std::vector<cmPkgConfigEntry> const& entries, cmPkgConfigEnv& env);
 
   static cmPkgConfigVersionReq ParseVersion(std::string const& version);