diff --git a/ppl-testsuite.spec b/ppl-testsuite.spec
index 456923b..8c2fd35 100644
--- a/ppl-testsuite.spec
+++ b/ppl-testsuite.spec
@@ -89,7 +89,7 @@ using the Parma Polyhedra Library (PPL). Install this package if you
 want to program with the PPL.
 
 %prep
-%autosetup -p1
+%autosetup -p1 -n ppl-%version
 
 %build
 %if "%{name}" == "ppl-testsuite"
diff --git a/ppl.spec b/ppl.spec
index 6fc115a..8ad3d23 100644
--- a/ppl.spec
+++ b/ppl.spec
@@ -89,7 +89,7 @@ using the Parma Polyhedra Library (PPL). Install this package if you
 want to program with the PPL.
 
 %prep
-%autosetup -p1
+%autosetup -p1 -n ppl-%version
 
 %build
 %if "%{name}" == "ppl-testsuite"