diff --git a/pcapdiff.spec b/pcapdiff.spec
index 9f8f4f1..34f2b7b 100644
--- a/pcapdiff.spec
+++ b/pcapdiff.spec
@@ -26,7 +26,7 @@ and EFF's Test Your ISP Project for more background.
 
 %prep
 %setup -qn pcapdiff
-%patch0 -p0
+%patch -P0 -p0
 
 %build