diff --git a/images/Dockerfile.alpine b/images/Dockerfile.alpine
index 0f261da5e..5b423a749 100644
--- a/images/Dockerfile.alpine
+++ b/images/Dockerfile.alpine
@@ -94,7 +94,7 @@ RUN apk --no-cache add  \
 ####                    Common to a Model                  ####
 ###############################################################
 FROM common AS generic
-RUN if [ ${TARGETARCH} != "arm64" ];then apk --no-cache add grub-bios; fi
+RUN if [ "${TARGETARCH}" != "arm64" ];then apk --no-cache add grub-bios; fi
 RUN apk --no-cache add  \
       bonding \
       bridge \