diff --git a/libqpdf/Pl_ASCII85Decoder.cc b/libqpdf/Pl_ASCII85Decoder.cc
index 4ecdaf41..999ef0ae 100644
--- a/libqpdf/Pl_ASCII85Decoder.cc
+++ b/libqpdf/Pl_ASCII85Decoder.cc
@@ -3,6 +3,7 @@
 #include <qpdf/QTC.hh>
 #include <string.h>
 
+DLL_EXPORT
 Pl_ASCII85Decoder::Pl_ASCII85Decoder(char const* identifier, Pipeline* next) :
     Pipeline(identifier, next),
     pos(0),
@@ -11,10 +12,12 @@ Pl_ASCII85Decoder::Pl_ASCII85Decoder(char const* identifier, Pipeline* next) :
     memset(this->inbuf, 117, 5);
 }
 
+DLL_EXPORT
 Pl_ASCII85Decoder::~Pl_ASCII85Decoder()
 {
 }
 
+DLL_EXPORT
 void
 Pl_ASCII85Decoder::write(unsigned char* buf, int len)
 {
@@ -123,6 +126,7 @@ Pl_ASCII85Decoder::flush()
     memset(this->inbuf, 117, 5);
 }
 
+DLL_EXPORT
 void
 Pl_ASCII85Decoder::finish()
 {
diff --git a/libqpdf/qpdf/Pl_ASCII85Decoder.hh b/libqpdf/qpdf/Pl_ASCII85Decoder.hh
index 9883a58e..6efd8199 100644
--- a/libqpdf/qpdf/Pl_ASCII85Decoder.hh
+++ b/libqpdf/qpdf/Pl_ASCII85Decoder.hh
@@ -7,9 +7,13 @@
 class Pl_ASCII85Decoder: public Pipeline
 {
   public:
+    DLL_EXPORT
     Pl_ASCII85Decoder(char const* identifier, Pipeline* next);
+    DLL_EXPORT
     virtual ~Pl_ASCII85Decoder();
+    DLL_EXPORT
     virtual void write(unsigned char* buf, int len);
+    DLL_EXPORT
     virtual void finish();
 
   private: