diff --git a/Dockerfile b/Dockerfile
index 49567ee..3bc3580 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,8 +11,9 @@ WORKDIR /app
 RUN echo ${TARGETPLATFORM}
 
 RUN apt-get update -y && \
-    apt-get install -y wget tar --no-install-recommends && \
-    GO_ARCH=$(echo $TARGETPLATFORM | sed 's|/|-|g') && \
+    apt-get install -y wget tar --no-install-recommends
+
+RUN export GO_ARCH=$(echo $TARGETPLATFORM | sed 's|/|-|g') && \
     wget -q "https://go.dev/dl/go${GO_VERSION}.${GO_ARCH}.tar.gz" && \
     tar -C /usr/local -xzf go${GO_VERSION}.${GO_ARCH}.tar.gz && \
     rm ./go${GO_VERSION}.${GO_ARCH}.tar.gz