diff --git a/usr.bin/calendar/calendars/calendar.croatian b/usr.bin/calendar/calendars/calendar.croatian
index af9a55854387..443122744d3f 100644
--- a/usr.bin/calendar/calendars/calendar.croatian
+++ b/usr.bin/calendar/calendars/calendar.croatian
@@ -7,6 +7,6 @@
 #ifndef _calendar_croatian_
 #define _calendar_croatian_
 
-#include <hr_HR.ISO_8859-2/calendar.all>
+#include <hr_HR.ISO8859-2/calendar.all>
 
 #endif /* !_calendar_croatian_ */
diff --git a/usr.bin/calendar/calendars/calendar.german b/usr.bin/calendar/calendars/calendar.german
index d22207cfd500..635aef1d5735 100644
--- a/usr.bin/calendar/calendars/calendar.german
+++ b/usr.bin/calendar/calendars/calendar.german
@@ -7,6 +7,6 @@
 #ifndef _calendar_german_
 #define _calendar_german_
 
-#include <de_DE.ISO_8859-1/calendar.all>
+#include <de_DE.ISO8859-1/calendar.all>
 
 #endif /* !_calendar_german_ */