diff --git a/setup.py b/setup.py
index 589e5685e66..c611bf2549e 100644
--- a/setup.py
+++ b/setup.py
@@ -335,7 +335,7 @@ def detect_modules(self):
         if have_unicode:
             exts.append( Extension('unicodedata', ['unicodedata.c']) )
         # access to ISO C locale support
-        if platform in ['cygwin']:
+        if platform in ['cygwin', 'aix4']:
             locale_libs = ['intl']
         else:
             locale_libs = []