diff --git a/src/sampleconf/mimemap b/src/sampleconf/mimemap
index 88bb5d9f..5b307fc4 100644
--- a/src/sampleconf/mimemap
+++ b/src/sampleconf/mimemap
@@ -97,6 +97,7 @@
 .info = application/x-gnuinfo
 .kwd = application/x-kword
 .gnumeric = application/x-gnumeric
+.gnm = application/x-gnumeric
 
 .wpd = application/vnd.wordperfect