diff --git a/pb/build_rprotoc b/pb/build_rprotoc
index 4ee40c624..84f8ebd66 100755
--- a/pb/build_rprotoc
+++ b/pb/build_rprotoc
@@ -9,6 +9,7 @@ command -v "bundle" || { echo >&2 "bundle is required but not installed.  Skippi
 
 # creates a bin folder with 'rprotoc' command inside
 #echo "skipping creation of binstubs as it breaks bin/ruby-protoc invocation below"
+rm Gemfile.lock
 bundle install --binstubs 
 
 # die on error at this point