diff --git a/python/Makefile.am b/python/Makefile.am
index 67d58e68270e638c5ca7cfc429432a8059a50071_cHl0aG9uL01ha2VmaWxlLmFt..4239d58dca0d69d2d799a87951842e7b89c7c8a8_cHl0aG9uL01ha2VmaWxlLmFt 100644
--- a/python/Makefile.am
+++ b/python/Makefile.am
@@ -1,4 +1,8 @@
-# Makefile for libxml2 python library
+# Makefile for libxslt python library
+
+# We use a rule with multiple output files which creates problems with
+# parallel builds.
+.NOTPARALLEL:
 
 SUBDIRS = . tests