diff --git a/pdal/PluginDirectory.hpp b/pdal/PluginDirectory.hpp
index 7a51eac5a6..d7e82482b5 100644
--- a/pdal/PluginDirectory.hpp
+++ b/pdal/PluginDirectory.hpp
@@ -57,7 +57,7 @@ class PluginDirectory
     std::map<std::string, std::string> m_drivers;
 
 private:
-    static StringList test_pluginSearchPaths();
+    PDAL_DLL static StringList test_pluginSearchPaths();
 };
 
 } // namespace pdal