diff --git a/scripts/genproto.sh b/scripts/genproto.sh
index 3c4a26658..dee51d4aa 100755
--- a/scripts/genproto.sh
+++ b/scripts/genproto.sh
@@ -43,11 +43,11 @@ for dir in ${DIRS}; do
 		protoc --gogofast_out=Mgoogle/protobuf/timestamp.proto=github.com/gogo/protobuf/types,paths=source_relative:. -I=. \
             -I="${GOGOPROTO_PATH}" \
             ./io/prometheus/client/*.proto
-		sed -i.bak -E 's/import _ \"github.com\/gogo\/protobuf\/gogoproto\"//g' -- *.pb.go
-		sed -i.bak -E 's/import _ \"google\/protobuf\"//g' -- *.pb.go
-		sed -i.bak -E 's/\t_ \"google\/protobuf\"//g' -- *.pb.go
-		sed -i.bak -E 's/golang\/protobuf\/descriptor/gogo\/protobuf\/protoc-gen-gogo\/descriptor/g' -- *.go
-		sed -i.bak -E 's/golang\/protobuf/gogo\/protobuf/g' -- *.go
+		sed -i.bak -E 's/import _ \"github.com\/gogo\/protobuf\/gogoproto\"//g' *.pb.go
+		sed -i.bak -E 's/import _ \"google\/protobuf\"//g' *.pb.go
+		sed -i.bak -E 's/\t_ \"google\/protobuf\"//g' *.pb.go
+		sed -i.bak -E 's/golang\/protobuf\/descriptor/gogo\/protobuf\/protoc-gen-gogo\/descriptor/g' *.go
+		sed -i.bak -E 's/golang\/protobuf/gogo\/protobuf/g' *.go
 		rm -f -- *.bak
 		goimports -w ./*.go ./io/prometheus/client/*.go
 	popd