diff --git a/include/qpdf/DLL.h b/include/qpdf/DLL.h
index ccd05fc..1e5d8a1 100644
--- a/include/qpdf/DLL.h
+++ b/include/qpdf/DLL.h
@@ -25,8 +25,13 @@
 
 #if defined(_WIN32) && defined(DLL_EXPORT)
 # define QPDF_DLL __declspec(dllexport)
+# define QPDF_DLL_EXCEPTION
+#elif __GNUC__ >= 4
+# define QPDF_DLL __attribute__ ((visibility ("default")))
+# define QPDF_DLL_EXCEPTION __attribute__ ((visibility ("default")))
 #else
 # define QPDF_DLL
+# define QPDF_DLL_EXCEPTION
 #endif
 
 #endif /* QPDF_DLL_HH */
diff --git a/include/qpdf/QPDFExc.hh b/include/qpdf/QPDFExc.hh
index fe0aa1d..c538eb4 100644
--- a/include/qpdf/QPDFExc.hh
+++ b/include/qpdf/QPDFExc.hh
@@ -29,7 +29,7 @@
 #include <string>
 #include <stdexcept>
 
-class QPDFExc: public std::runtime_error
+class QPDF_DLL_EXCEPTION QPDFExc: public std::runtime_error
 {
   public:
     QPDF_DLL
diff --git a/include/qpdf/QPDFSystemError.hh b/include/qpdf/QPDFSystemError.hh
index c4e4871..cef8ea0 100644
--- a/include/qpdf/QPDFSystemError.hh
+++ b/include/qpdf/QPDFSystemError.hh
@@ -29,7 +29,7 @@
 #include <string>
 #include <stdexcept>
 
-class QPDFSystemError: public std::runtime_error
+class QPDF_DLL_EXCEPTION QPDFSystemError: public std::runtime_error
 {
   public:
     QPDF_DLL