diff --git a/nbdkit.spec b/nbdkit.spec
index df810bf..0bd349f 100644
--- a/nbdkit.spec
+++ b/nbdkit.spec
@@ -25,7 +25,7 @@
 %global verify_tarball_signature 1
 
 # If there are patches which touch autotools files, set this to 1.
-%global patches_touch_autotools %{nil}
+%global patches_touch_autotools 1
 
 # The source directory.
 %global source_directory 1.11-development