diff --git a/Source/cmFileSet.cxx b/Source/cmFileSet.cxx
index bcf7fbac13..b74855f212 100644
--- a/Source/cmFileSet.cxx
+++ b/Source/cmFileSet.cxx
@@ -80,6 +80,11 @@ bool cmFileSetVisibilityIsForInterface(cmFileSetVisibility vis)
   return false;
 }
 
+bool cmFileSetTypeCanBeIncluded(std::string const& type)
+{
+  return type == "HEADERS"_s;
+}
+
 cmFileSet::cmFileSet(cmake& cmakeInstance, std::string name, std::string type,
                      cmFileSetVisibility visibility)
   : CMakeInstance(cmakeInstance)
diff --git a/Source/cmFileSet.h b/Source/cmFileSet.h
index c508e2b101..6ad4c9e829 100644
--- a/Source/cmFileSet.h
+++ b/Source/cmFileSet.h
@@ -31,6 +31,8 @@ cmFileSetVisibility cmFileSetVisibilityFromName(cm::string_view name,
 bool cmFileSetVisibilityIsForSelf(cmFileSetVisibility vis);
 bool cmFileSetVisibilityIsForInterface(cmFileSetVisibility vis);
 
+bool cmFileSetTypeCanBeIncluded(std::string const& type);
+
 class cmFileSet
 {
 public: