diff --git a/prebuilt/common/lib/content-types.properties b/prebuilt/common/lib/content-types.properties
index f4c657c4..42172210 100644
--- a/prebuilt/common/lib/content-types.properties
+++ b/prebuilt/common/lib/content-types.properties
@@ -2,7 +2,7 @@
 
 docm=application/vnd.ms-word.document.macroenabled.12
 xlsb=application/vnd.ms-excel.sheet.binary.macroenabled.12
-xlsm=application/vnd.ms-excel.sheet.macroEnabled.12
+xlsm=application/vnd.ms-excel.sheet.macroenabled.12
 ppsm=application/vnd.ms-powerpoint.slideshow.macroenabled.12
 ppsx=application/vnd.openxmlformats-officedocument.presentationml.slideshow
 pptm=application/vnd.ms-powerpoint.presentation.macroenabled.12
\ No newline at end of file