1 files changed, 18 insertions, 13 deletions
diff --git a/libqpdf/QPDFAcroFormDocumentHelper.cc b/libqpdf/QPDFAcroFormDocumentHelper.cc
index 0354a28f..6d4b3b83 100644
--- a/libqpdf/QPDFAcroFormDocumentHelper.cc
+++ b/libqpdf/QPDFAcroFormDocumentHelper.cc
@@ -543,20 +543,25 @@ QPDFAcroFormDocumentHelper::adjustInheritedFields(
     }
 }
 
-class ResourceReplacer: public QPDFObjectHandle::TokenFilter
+namespace
 {
-  public:
-    ResourceReplacer(
-        std::map<std::string, std::map<std::string, std::string>> const& dr_map,
-        std::map<std::string, std::map<std::string, std::set<size_t>>> const&
-            rnames);
-    virtual ~ResourceReplacer() = default;
-    virtual void handleToken(QPDFTokenizer::Token const&) override;
-
-  private:
-    size_t offset;
-    std::map<std::string, std::map<size_t, std::string>> to_replace;
-};
+    class ResourceReplacer: public QPDFObjectHandle::TokenFilter
+    {
+      public:
+        ResourceReplacer(
+            std::map<std::string, std::map<std::string, std::string>> const&
+                dr_map,
+            std::map<
+                std::string,
+                std::map<std::string, std::set<size_t>>> const& rnames);
+        virtual ~ResourceReplacer() = default;
+        virtual void handleToken(QPDFTokenizer::Token const&) override;
+
+      private:
+        size_t offset;
+        std::map<std::string, std::map<size_t, std::string>> to_replace;
+    };
+} // namespace
 
 ResourceReplacer::ResourceReplacer(
     std::map<std::string, std::map<std::string, std::string>> const& dr_map,