diff --git a/tests/Tests.h b/tests/Tests.h
index eec3d665..28a11b7e 100644
--- a/tests/Tests.h
+++ b/tests/Tests.h
@@ -3,7 +3,7 @@
 #if defined(_MSC_VER)
 #define DLL_API __declspec(dllexport)
 #else
-#define DLL_API
+#define DLL_API __attribute__ ((visibility ("default")))
 #endif
 
 #define CS_OUT
\ No newline at end of file