diff --git a/compat/mingw.c b/compat/mingw.c
index 0456319ba6..b18231e903 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -235,7 +235,7 @@ int pipe(int filedes[2])
 		CloseHandle(h[0]);
 		return -1;
 	}
-	fd = _open_osfhandle(h[0], O_NOINHERIT);
+	fd = _open_osfhandle((int)h[0], O_NOINHERIT);
 	if (fd < 0) {
 		close(filedes[0]);
 		close(filedes[1]);
@@ -245,7 +245,7 @@ int pipe(int filedes[2])
 	}
 	close(filedes[0]);
 	filedes[0] = fd;
-	fd = _open_osfhandle(h[1], O_NOINHERIT);
+	fd = _open_osfhandle((int)h[1], O_NOINHERIT);
 	if (fd < 0) {
 		close(filedes[0]);
 		close(filedes[1]);