diff --git a/include/opus_defines.h b/include/opus_defines.h
index 647ed5d6f2e399fd29c113ff023d8b08d5403898..315412dd1d2383cf9009690d3aa102aaa30aa813 100644
--- a/include/opus_defines.h
+++ b/include/opus_defines.h
@@ -65,7 +65,7 @@ extern "C" {
 
 #ifndef OPUS_EXPORT
 # if defined(WIN32)
-#  ifdef OPUS_BUILD
+#  if defined(OPUS_BUILD) && defined(DLL_EXPORT)
 #   define OPUS_EXPORT __declspec(dllexport)
 #  else
 #   define OPUS_EXPORT