diff --git a/build-support/scripts/protobuf.sh b/build-support/scripts/protobuf.sh
index 7b815d355e..f9c1937674 100755
--- a/build-support/scripts/protobuf.sh
+++ b/build-support/scripts/protobuf.sh
@@ -42,6 +42,9 @@ function main {
         esac
     done
 
+    # clear old ratelimit.tmp files
+    find . -name .ratelimit.tmp -delete
+
     local mods=$(find . -name 'buf.gen.yaml' -exec dirname {} \; | sort)
     for mod in $mods
     do