diff --git a/op/Dockerfile b/op/Dockerfile
index 60bacd81..b99552b7 100644
--- a/op/Dockerfile
+++ b/op/Dockerfile
@@ -19,7 +19,7 @@ FROM golang:1.21 as geth
 WORKDIR /app
 
 ARG GETH_REPO=https://github.com/ethereum-optimism/op-geth.git
-ARG GETH_VERSION= v1.101315.1
+ARG GETH_VERSION=v1.101315.1
 
 # avoid depth=1, so the geth build can read tags
 RUN git clone $GETH_REPO --branch $GETH_VERSION --single-branch . && \