diff --git a/tools/snap/build.sh b/tools/snap/build.sh
index e0f0c781c..776714439 100755
--- a/tools/snap/build.sh
+++ b/tools/snap/build.sh
@@ -38,4 +38,4 @@ docker run \
   -w "/certbot" \
   -e "PIP_EXTRA_INDEX_URL=http://localhost:8080" \
   "adferrand/snapcraft:${DOCKER_ARCH}-stable" \
-  snapcraft
+  /bin/bash -c "snapcraft clean && snapcraft"
diff --git a/tools/snap/build_dns.sh b/tools/snap/build_dns.sh
index 3553ab106..aba008d7e 100755
--- a/tools/snap/build_dns.sh
+++ b/tools/snap/build_dns.sh
@@ -54,6 +54,7 @@ IFS=","
 for DNS_PLUGIN in ${DNS_PLUGINS}; do
   pushd "${DNS_PLUGIN}"
   cp /snap-constraints.txt .
+  snapcraft clean
   snapcraft
   popd
 done