diff --git a/public/fpdfview.h b/public/fpdfview.h
index 7378d5f..6d37d9e 100644
--- a/public/fpdfview.h
+++ b/public/fpdfview.h
@@ -126,14 +126,20 @@ typedef struct _FS_RECTF_ {
 // Const Pointer to FS_RECTF structure.
 typedef const FS_RECTF* FS_LPCRECTF;
 
-#if defined(_WIN32) && defined(FPDFSDK_EXPORTS)
-// On Windows system, functions are exported in a DLL
+#if defined(PDFIUM_DLLIMPLEMENTATION)
+#ifdef _WIN32
 #define DLLEXPORT __declspec(dllexport)
-#define STDCALL __stdcall
 #else
-#define DLLEXPORT
-#define STDCALL
+#define DLLEXPORT __attribute__ ((visibility("default")))
+#endif
+#else
+#ifdef _WIN32
+#define DLLEXPORT __declspec(dllimport)
+#else
+#define DLLEXPORT __attribute__ ((visibility("default")))
 #endif
+#endif
+#define STDCALL
 
 // Exported Functions
 #ifdef __cplusplus