diff --git a/Makefile.am b/Makefile.am
index f83007c..2a05035 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -6,6 +6,7 @@ endif
 AM_CXXFLAGS = @visibility@
 
 lib_LTLIBRARIES = %D%/librtaudio.la
+%C%_librtaudio_la_CXXFLAGS = -DRTAUDIO_EXPORT
 %C%_librtaudio_la_LDFLAGS = -no-undefined -export-dynamic -version-info @SO_VERSION@
 %C%_librtaudio_la_SOURCES = \
   %D%/RtAudio.cpp \
diff --git a/rtaudio_c.h b/rtaudio_c.h
index 893917c..a13ea79 100644
--- a/rtaudio_c.h
+++ b/rtaudio_c.h
@@ -2,8 +2,12 @@
 #define RTAUDIO_C_H
 
 #if defined(RTAUDIO_EXPORT)
+#ifdef WIN32
 #define RTAUDIOAPI __declspec(dllexport)
 #else
+#define RTAUDIOAPI __attribute__((visibility("default")))
+#endif
+#else
 #define RTAUDIOAPI //__declspec(dllimport)
 #endif