diff --git a/CMakeLists.txt b/CMakeLists.txt
index 543edf4d..3e865e3d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -141,6 +141,9 @@ IF(CMAKE_SYSTEM_NAME STREQUAL "SunOS")
   LIST(APPEND MAIKO_DEFINITIONS
     "-DOS5"
   )
+  LIST(APPEND MAIKO_INIT_DEFINITIONS
+    "-DOS5"
+  )
 ENDIF()
 
 IF(APPLE)