diff --git a/.woodpecker/.build.yml b/.woodpecker/.build.yml
index 1698129..b0fd267 100644
--- a/.woodpecker/.build.yml
+++ b/.woodpecker/.build.yml
@@ -45,7 +45,7 @@ pipeline:
 
       - export OBJ_PATH="/vieter/commits/$CI_COMMIT_SHA/vieter-$(echo '${PLATFORM}' | sed 's:/:-:g')"
       - export SIG_STRING="PUT\n\n$CONTENT_TYPE\n$DATE\n$OBJ_PATH"
-      - export SIGNATURE=`echo -en $SIG_STRING | openssl sha1 -hmac $S3_PASSWORD -binary | base64`
+      - export SIGNATURE="$(echo -en $SIG_STRING | openssl sha1 -hmac $S3_PASSWORD -binary | base64)"
       - >
         curl 
         --silent