diff --git a/include/osgDB/fstream b/include/osgDB/fstream
index cb3c1bdcd..fb6f840aa 100644
--- a/include/osgDB/fstream
+++ b/include/osgDB/fstream
@@ -31,27 +31,27 @@ namespace osgDB
 
 void OSGDB_EXPORT open(std::fstream& fs, const char* filename,std::ios_base::openmode mode);
 
-class OSGDB_EXPORT ifstream : public std::ifstream
+class ifstream : public std::ifstream
 {
 public:
-    ifstream();
-    explicit ifstream(const char* filename,
+    OSGDB_EXPORT ifstream();
+    OSGDB_EXPORT explicit ifstream(const char* filename,
         std::ios_base::openmode mode = std::ios_base::in);
-    ~ifstream();
+    OSGDB_EXPORT ~ifstream();
 
-    void open(const char* filename,
+    void OSGDB_EXPORT open(const char* filename,
         std::ios_base::openmode mode = std::ios_base::in);
 };
 
-class OSGDB_EXPORT ofstream : public std::ofstream
+class ofstream : public std::ofstream
 {
 public:
-    ofstream();
-    explicit ofstream(const char* filename,
+    OSGDB_EXPORT ofstream();
+    OSGDB_EXPORT explicit ofstream(const char* filename,
         std::ios_base::openmode mode = std::ios_base::out);
-    ~ofstream();
+    OSGDB_EXPORT ~ofstream();
 
-    void open(const char* filename,
+    void OSGDB_EXPORT open(const char* filename,
         std::ios_base::openmode mode = std::ios_base::out);
 };