diff --git a/extra-cmake-modules.spec b/extra-cmake-modules.spec
index be89e2b..3a69ab6 100644
--- a/extra-cmake-modules.spec
+++ b/extra-cmake-modules.spec
@@ -75,7 +75,7 @@ Additional modules for CMake build system needed by KDE Frameworks.
 
 
 %prep
-%autosetup -p1 -a1
+%autosetup -p1 %{?clang:-a1}
 
 
 %build