diff --git a/mingw-w64-crt/Makefile.am b/mingw-w64-crt/Makefile.am
index d68cf4a..b432ee5 100644
--- a/mingw-w64-crt/Makefile.am
+++ b/mingw-w64-crt/Makefile.am
@@ -2380,6 +2380,7 @@
 		%/libapi-ms-win-core-apiquery-l2-1-0.a \
 		%/libapi-ms-win-core-atoms-l1-1-0.a \
 		%/libapi-ms-win-core-backgroundtask-l1-1-0.a \
+		%/libapi-ms-win-core-calendar-l1-1-0.a \
 		%/libapi-ms-win-core-com-l1-1-0.a \
 		%/libapi-ms-win-core-com-l1-1-1.a \
 		%/libapi-ms-win-core-com-l1-1-2.a \
diff --git a/mingw-w64-crt/lib-common/api-ms-win-core-calendar-l1-1-0.def b/mingw-w64-crt/lib-common/api-ms-win-core-calendar-l1-1-0.def
new file mode 100644
index 0000000..489c518
--- /dev/null
+++ b/mingw-w64-crt/lib-common/api-ms-win-core-calendar-l1-1-0.def
@@ -0,0 +1,11 @@
+LIBRARY api-ms-win-core-calendar-l1-1-0
+
+EXPORTS
+
+AdjustCalendarDate
+ConvertCalDateTimeToSystemTime
+ConvertSystemTimeToCalDateTime
+GetCalendarDateFormatEx
+GetCalendarSupportedDateRange
+IsCalendarLeapYear
+UpdateCalendarDayOfWeek
diff --git a/mingw-w64-crt/lib-common/onecore_apiset.mri b/mingw-w64-crt/lib-common/onecore_apiset.mri
index bb31584..f9033a3 100644
--- a/mingw-w64-crt/lib-common/onecore_apiset.mri
+++ b/mingw-w64-crt/lib-common/onecore_apiset.mri
@@ -2,7 +2,7 @@
 ADDLIB libapi-ms-win-core-apiquery-l2-1-0.a
 ADDLIB libapi-ms-win-core-atoms-l1-1-0.a
 ADDLIB libapi-ms-win-core-backgroundtask-l1-1-0.a
-; FIXME libapi-ms-win-core-calendar-l1-1-0.a
+ADDLIB libapi-ms-win-core-calendar-l1-1-0.a
 ADDLIB libapi-ms-win-core-com-l1-1-0.a
 ADDLIB libapi-ms-win-core-com-l1-1-1.a
 ADDLIB libapi-ms-win-core-com-l1-1-2.a
diff --git a/mingw-w64-crt/lib32/api-ms-win-core-calendar-l1-1-0.def b/mingw-w64-crt/lib32/api-ms-win-core-calendar-l1-1-0.def
new file mode 100644
index 0000000..42bf009
--- /dev/null
+++ b/mingw-w64-crt/lib32/api-ms-win-core-calendar-l1-1-0.def
@@ -0,0 +1,11 @@
+LIBRARY api-ms-win-core-calendar-l1-1-0
+
+EXPORTS
+
+AdjustCalendarDate@12
+ConvertCalDateTimeToSystemTime@8
+ConvertSystemTimeToCalDateTime@12
+GetCalendarDateFormatEx@24
+GetCalendarSupportedDateRange@12
+IsCalendarLeapYear@12
+UpdateCalendarDayOfWeek@4