diff --git a/include/event2/visibility.h b/include/event2/visibility.h
index 5e7163a1..fb16dbee 100644
--- a/include/event2/visibility.h
+++ b/include/event2/visibility.h
@@ -30,26 +30,21 @@
 #include <event2/event-config.h>
 
 #if defined(event_EXPORTS) || defined(event_extra_EXPORTS) || defined(event_core_EXPORTS)
-
-#if defined (__SUNPRO_C) && (__SUNPRO_C >= 0x550)
-#define EVENT2_EXPORT_SYMBOL __global
-#elif defined __GNUC__
-#define EVENT2_EXPORT_SYMBOL __attribute__ ((visibility("default")))
-#elif defined(_MSC_VER)
-#define EVENT2_EXPORT_SYMBOL extern __declspec(dllexport)
+# if defined (__SUNPRO_C) && (__SUNPRO_C >= 0x550)
+#  define EVENT2_EXPORT_SYMBOL __global
+# elif defined __GNUC__
+#  define EVENT2_EXPORT_SYMBOL __attribute__ ((visibility("default")))
+# elif defined(_MSC_VER)
+#  define EVENT2_EXPORT_SYMBOL extern __declspec(dllexport)
+# else
+#  define EVENT2_EXPORT_SYMBOL /* unknown compiler */
+# endif
 #else
-/* unknown compiler */
-#define EVENT2_EXPORT_SYMBOL
-#endif
-
-#else
-
-#if defined(EVENT__NEED_DLLIMPORT) && defined(_MSC_VER) && !defined(EVENT_BUILDING_REGRESS_TEST)
-#define EVENT2_EXPORT_SYMBOL extern __declspec(dllimport)
-#else
-#define EVENT2_EXPORT_SYMBOL
-#endif
-
+# if defined(EVENT__NEED_DLLIMPORT) && defined(_MSC_VER) && !defined(EVENT_BUILDING_REGRESS_TEST)
+#  define EVENT2_EXPORT_SYMBOL extern __declspec(dllimport)
+# else
+#  define EVENT2_EXPORT_SYMBOL
+# endif
 #endif
 
 #endif /* EVENT2_VISIBILITY_H_INCLUDED_ */