1 files changed, 3 insertions, 3 deletions
diff --git a/libqpdf/qpdf/Pl_Base64.hh b/libqpdf/qpdf/Pl_Base64.hh
index 313bd2cb..788bfd6d 100644
--- a/libqpdf/qpdf/Pl_Base64.hh
+++ b/libqpdf/qpdf/Pl_Base64.hh
@@ -9,12 +9,12 @@ class Pl_Base64: public Pipeline
     enum action_e { a_encode, a_decode };
     Pl_Base64(char const* identifier, Pipeline* next, action_e);
     virtual ~Pl_Base64() = default;
-    virtual void write(unsigned char* buf, size_t len) override;
+    virtual void write(unsigned char const* buf, size_t len) override;
     virtual void finish() override;
 
   private:
-    void decode(unsigned char* buf, size_t len);
-    void encode(unsigned char* buf, size_t len);
+    void decode(unsigned char const* buf, size_t len);
+    void encode(unsigned char const* buf, size_t len);
     void flush();
     void flush_decode();
     void flush_encode();