diff --git a/src/sampleconf/mimemap b/src/sampleconf/mimemap
index e676f6ec..7418fd75 100644
--- a/src/sampleconf/mimemap
+++ b/src/sampleconf/mimemap
@@ -152,6 +152,7 @@
 .xlsb = application/vnd.ms-excel.sheet.binary.macroEnabled.12
 .xlsm = application/vnd.ms-excel.sheet.macroEnabled.12
 .xlsx = application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
+.xlsm = application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
 .xltm = application/vnd.ms-excel.template.macroEnabled.12
 .xltx = application/vnd.openxmlformats-officedocument.spreadsheetml.template