diff --git a/unlambda.spec b/unlambda.spec
index 343a14d..52b7d17 100644
--- a/unlambda.spec
+++ b/unlambda.spec
@@ -82,7 +82,7 @@ This package provides the Haskell %{name} profiling library.
 # Begin cabal-rpm setup:
 %setup -q
 # End cabal-rpm setup
-%patch0 -p1
+%patch -P0 -p1
 iconv -f iso8859-1 -t utf-8 Language/Unlambda.hs > Language/Unlambda.conv && mv -f Language/Unlambda.conv Language/Unlambda.hs
 
 %build