diff --git a/docs/apibuild.py b/docs/apibuild.py
index b00619fc266f430513b264970415d1bba277bf25..c5257f38136a2970167ed761ecbd235884e9c4df 100755
--- a/docs/apibuild.py
+++ b/docs/apibuild.py
@@ -55,7 +55,9 @@ def uniq(items):
     d = {}
     for item in items:
         d[item]=1
-    return d.keys()
+    k = d.keys()
+    k.sort()
+    return k
 
 class identifier:
     def __init__(self, name, header=None, module=None, type=None, lineno = 0,