diff --git a/History.md b/History.md
index c8bbc05b..c62ca7c2 100644
--- a/History.md
+++ b/History.md
@@ -2,6 +2,7 @@
 =====
 
 - support different ship to address
+- allow for diffent namespace prefixes #140
 
 1.7.5
 =====
diff --git a/src/main/java/org/mustangproject/ZUGFeRD/CustomXMLProvider.java b/src/main/java/org/mustangproject/ZUGFeRD/CustomXMLProvider.java
index 6ac2c275..0b03bd69 100644
--- a/src/main/java/org/mustangproject/ZUGFeRD/CustomXMLProvider.java
+++ b/src/main/java/org/mustangproject/ZUGFeRD/CustomXMLProvider.java
@@ -29,8 +29,8 @@ public class CustomXMLProvider implements IXMLProvider, IProfileProvider {
 
 	public void setXML(byte[] newData) {
 		String zf = new String(newData);
-		if (!zf.contains("<rsm:CrossIndustry")) {
-			throw new RuntimeException("ZUGFeRD XML does not contain <rsm:CrossIndustry and can thus not be valid");
+		if (!zf.contains("CrossIndustry")) {
+			throw new RuntimeException("ZUGFeRD XML does not contain (<rsm:)CrossIndustry and can thus not be valid");
 		}
 
 		zugferdData = newData;