diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index ec681a6500..c8ab360e44 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -2604,6 +2604,7 @@ void cmGlobalGenerator::ClearGeneratorMembers()
   this->RuleHashes.clear();
   this->DirectoryContentMap.clear();
   this->ExistingSourceFiles.clear();
+  this->RealPaths.clear();
   this->XcFrameworkPListContentMap.clear();
   this->BinaryDirectories.clear();
   this->GeneratedFiles.clear();
diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index 6b8995d70a..330d9a5a29 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -1544,7 +1544,8 @@ std::vector<BT<std::string>> cmLocalGenerator::GetIncludeDirectoriesImplicit(
   if (!stripImplicitDirs) {
     // Append implicit directories that were requested by the user only
     for (BT<std::string> const& udr : userDirs) {
-      if (cm::contains(implicitSet, cmSystemTools::GetRealPath(udr.Value))) {
+      if (cm::contains(implicitSet,
+                       this->GlobalGenerator->GetRealPath(udr.Value))) {
         emitBT(udr);
       }
     }