diff --git a/LibConf b/LibConf
index c4e55eb..113fb09 100644
--- a/LibConf
+++ b/LibConf
@@ -15,19 +15,22 @@ mijin_sources = Split("""
 
 lib_libbacktrace = env.Cook('libbacktrace')
 
+cppdefines = []
+if env['BUILD_TYPE'] == 'debug':
+    cppdefines += ['MIJIN_DEBUG=1', 'MIJIN_CHECKED_ITERATORS=1']
+
+
 lib_mijin = env.UnityStaticLibrary(
     target = env['LIB_DIR']  + '/mijin',
     source = mijin_sources,
-    dependencies = [lib_libbacktrace]
+    dependencies = [lib_libbacktrace],
+    CPPDEFINES = list(env['CPPDEFINES']) + cppdefines
 )
 
 LIB_CONFIG = {
     'CPPPATH': [env.Dir('source')],
-    'CPPDEFINES': [],
+    'CPPDEFINES': cppdefines,
     'DEPENDENCIES': [lib_mijin]
 }
 
-if env['BUILD_TYPE'] == 'debug':
-    LIB_CONFIG['CPPDEFINES'].extend(['MIJIN_DEBUG=1', 'MIJIN_CHECKED_ITERATORS=1'])
-
 Return('LIB_CONFIG')