diff --git a/scripts/sonar b/scripts/sonar
index 3fa01155a..21d6154aa 100755
--- a/scripts/sonar
+++ b/scripts/sonar
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-apt update
+apt clean; apt update
 mk-build-deps --install --remove \
     --tool "apt-get -o Debug::pkgProblemResolver=yes -q -y" \
     debian/control