diff --git a/libnbd.spec b/libnbd.spec
index 6bc4b26..b9dc9cd 100644
--- a/libnbd.spec
+++ b/libnbd.spec
@@ -5,7 +5,7 @@
 %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 1.15-development