diff --git a/mingw-w64-crt/Makefile.am b/mingw-w64-crt/Makefile.am
index da258da..d68cf4a 100644
--- a/mingw-w64-crt/Makefile.am
+++ b/mingw-w64-crt/Makefile.am
@@ -2379,6 +2379,7 @@
 %/libonecore_apiset.a: lib-common/onecore_apiset.mri \
 		%/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-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-backgroundtask-l1-1-0.def b/mingw-w64-crt/lib-common/api-ms-win-core-backgroundtask-l1-1-0.def
new file mode 100644
index 0000000..e0d183e
--- /dev/null
+++ b/mingw-w64-crt/lib-common/api-ms-win-core-backgroundtask-l1-1-0.def
@@ -0,0 +1,5 @@
+LIBRARY api-ms-win-core-backgroundtask-l1-1-0
+
+EXPORTS
+
+RaiseCustomSystemEventTrigger
diff --git a/mingw-w64-crt/lib-common/onecore_apiset.mri b/mingw-w64-crt/lib-common/onecore_apiset.mri
index 4584bf2..bb31584 100644
--- a/mingw-w64-crt/lib-common/onecore_apiset.mri
+++ b/mingw-w64-crt/lib-common/onecore_apiset.mri
@@ -1,7 +1,7 @@
 CREATE libonecore_apiset.a
 ADDLIB libapi-ms-win-core-apiquery-l2-1-0.a
 ADDLIB libapi-ms-win-core-atoms-l1-1-0.a
-; FIXME libapi-ms-win-core-backgroundtask-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-com-l1-1-0.a
 ADDLIB libapi-ms-win-core-com-l1-1-1.a
diff --git a/mingw-w64-crt/lib32/api-ms-win-core-backgroundtask-l1-1-0.def b/mingw-w64-crt/lib32/api-ms-win-core-backgroundtask-l1-1-0.def
new file mode 100644
index 0000000..45c8723
--- /dev/null
+++ b/mingw-w64-crt/lib32/api-ms-win-core-backgroundtask-l1-1-0.def
@@ -0,0 +1,5 @@
+LIBRARY api-ms-win-core-backgroundtask-l1-1-0
+
+EXPORTS
+
+RaiseCustomSystemEventTrigger@4