diff --git a/debian/qualify-clang.sh b/debian/qualify-clang.sh
index 8adcdecb..cb7a2368 100755
--- a/debian/qualify-clang.sh
+++ b/debian/qualify-clang.sh
@@ -32,12 +32,13 @@ fi
 
 # allow usr/lib/llvm-@LLVM_VERSION@/lib/libLLVM-@LLVM_VERSION@*.so
 # as it is in llvm-X.Y-dev
-NBLINES=$(ls -1 /usr/lib/llvm-$VERSION/lib/libLLVM*.so*|grep -v llvm-$VERSION/lib/libLLVM-$VERSION*.so|wc -l)
-if test $NBLINES -ne 0; then
+NBLINES=$(ls -1 /usr/lib/llvm-$VERSION/lib/libLLVM*.so*|wc -l)
+if test $NBLINES -ne 1; then
     echo "Found some libLLVM into /usr/lib/llvm-$VERSION/lib/"
     echo "See:"
     ls -al /usr/lib/llvm-$VERSION/lib/libLLVM*.so*
     echo "Break the build as it breaks the coinstalability"
+    echo "we should have only one for llvm-X.Y-dev"
     exit 1
 fi