diff --git a/action.yml b/action.yml
index 66c6a50..77369dd 100644
--- a/action.yml
+++ b/action.yml
@@ -83,7 +83,7 @@ runs:
         # We get a JSON with an signedUploadUrl similar to :
         #  https://entrepot.xlii.si/twirp/github.actions.results.api.v1.ArtifactService/UploadArtifact?sig=yWWEI8tIIECp8D7E5TVh4_6G2pZxWaVdQcSYaCsx5s0=&expires=2024-08-26+07%3A20%3A49.886890537+%2B0200+CEST&artifactName=mymodule-1.2.3.zip&taskID=63
         SIGNED_UPLOAD_URL="$( echo "$RESPONSE" | sed -n 's/.*"signed_\?[uU]pload_\?[uU]rl" *: *"\([^"]\+\)".*/\1/p' )"
-        printf "$SIGNED_UPLOAD_URL" | base64
+        printf "%s" "$SIGNED_UPLOAD_URL" | base64
 
         # Upload our file
         # (note: adding '&comp=block' at the end of the URL)
@@ -94,7 +94,7 @@ runs:
           --method PUT \
           --body-file "$MYUPLOAD" \
           --header "x-ms-blob-content-type: zip" \
-          "$SIGNED_UPLOAD_URL&comp=block"
+          "$SIGNED_UPLOAD_URL"
 
         # Finalize the artifact
         RESPONSE="$( wget -O - \