diff --git a/src/libopensc/internal-winscard.h b/src/libopensc/internal-winscard.h
index 011167ddc..edc315ca2 100644
--- a/src/libopensc/internal-winscard.h
+++ b/src/libopensc/internal-winscard.h
@@ -138,6 +138,7 @@ typedef const SCARD_IO_REQUEST *LPCSCARD_IO_REQUEST;
 
 #endif	/* HAVE_SCARD_H */
 
+#ifndef PCSC_API
 #if defined(_WIN32)
 #define PCSC_API WINAPI
 #elif defined(USE_CYGWIN)
@@ -145,6 +146,12 @@ typedef const SCARD_IO_REQUEST *LPCSCARD_IO_REQUEST;
 #else
 #define PCSC_API
 #endif
+#endif
+
+#ifdef __APPLE__
+#define extern
+#define __attribute__(a)
+#endif
 
 typedef LONG (PCSC_API *SCardEstablishContext_t)(DWORD dwScope, LPCVOID pvReserved1,
 	LPCVOID pvReserved2, LPSCARDCONTEXT phContext);
@@ -174,6 +181,11 @@ typedef LONG (PCSC_API *SCardListReaders_t)(SCARDCONTEXT hContext, LPCSTR mszGro
 typedef LONG (PCSC_API *SCardGetAttrib_t)(SCARDHANDLE hCard, DWORD dwAttrId,\
 	LPBYTE pbAttr, LPDWORD pcbAttrLen);
 
+#ifdef __APPLE__
+#undef extern
+#undef __attribute__
+#endif
+
 /* Copied from pcsc-lite reader.h */
 
 #ifndef SCARD_CTL_CODE