diff --git a/extractor.go b/extractor.go
index 9059e1e..3406ce2 100644
--- a/extractor.go
+++ b/extractor.go
@@ -100,7 +100,7 @@ func valuesFromHeader(header, valuePrefix string) ValuesExtractor {
 		}
 
 		if len(value) > prefixLen && bytes.EqualFold(value[:prefixLen], []byte(valuePrefix)) {
-			return append([][]byte{}, value[:prefixLen]), nil
+			return append([][]byte{}, value[prefixLen:]), nil
 		}
 
 		return nil, errHeaderExtractorValueInvalid