diff --git a/IMFHeader.cpp b/IMFHeader.cpp
index 9e486ca..e87c5b0 100644
--- a/IMFHeader.cpp
+++ b/IMFHeader.cpp
@@ -9,7 +9,7 @@ namespace coreutils {
 
    IMFHeader::IMFHeader(PString &in) {
       printf("in='%s'\n", in.str().c_str());
-      key = in.getTokenInclude("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-");
+      key = in.getTokenInclude("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-0123456789");
       if(key.length() != 0) {
 	 if(!in.ifNext(":")) {
 	    printf("key=%s %02X\n", key.c_str(), in.str()[0]);