diff --git a/apis/atmos/src/main/java/org/jclouds/atmos/filters/SignRequest.java b/apis/atmos/src/main/java/org/jclouds/atmos/filters/SignRequest.java
index 8caff86cc0..d57595a156 100644
--- a/apis/atmos/src/main/java/org/jclouds/atmos/filters/SignRequest.java
+++ b/apis/atmos/src/main/java/org/jclouds/atmos/filters/SignRequest.java
@@ -171,8 +171,7 @@ public class SignRequest implements HttpRequestFilter {
    void appendHttpHeaders(HttpRequest request, StringBuilder toSign) {
       // Only the value is used, not the header
       // name. If a request does not include the header, this is an empty string.
-      for (String header : new String[] { "Range" })
-         toSign.append(HttpUtils.nullToEmpty(request.getHeaders().get(header)).toLowerCase()).append("\n");
+      toSign.append(HttpUtils.nullToEmpty(request.getHeaders().get("Range")).toLowerCase()).append("\n");
       // Standard HTTP header, in UTC format. Only the date value is used, not the header name.
       toSign.append(request.getFirstHeaderOrNull(HttpHeaders.DATE)).append("\n");
    }