diff --git a/builder/mingw-w64.go b/builder/mingw-w64.go
index db8b43c3..289a8548 100644
--- a/builder/mingw-w64.go
+++ b/builder/mingw-w64.go
@@ -52,7 +52,7 @@ func makeMinGWExtraLibs(tmpdir string) []*compileJob {
 	for _, name := range []string{
 		"kernel32.def.in",
 		"api-ms-win-crt-conio-l1-1-0.def",
-		"api-ms-win-crt-convert-l1-1-0.def",
+		"api-ms-win-crt-convert-l1-1-0.def.in",
 		"api-ms-win-crt-environment-l1-1-0.def",
 		"api-ms-win-crt-filesystem-l1-1-0.def",
 		"api-ms-win-crt-heap-l1-1-0.def",
diff --git a/lib/mingw-w64 b/lib/mingw-w64
index acc9b9d9..8526cb61 160000
--- a/lib/mingw-w64
+++ b/lib/mingw-w64
@@ -1 +1 @@
-Subproject commit acc9b9d9eb63a13d8122cbac4882eb5f4ee2f679
+Subproject commit 8526cb618269440a94810b94b77f8bd48c5c3396