1 files changed, 1 insertions, 0 deletions

diff --git a/uisimulator/x11/file.h b/uisimulator/x11/file.h
index 76ddd6b8bb..28c2f2c17a 100644
--- a/uisimulator/x11/file.h
+++ b/uisimulator/x11/file.h
@@ -30,3 +30,4 @@ extern int open(char* pathname, int flags);
 extern int close(int fd);
 extern int read(int fd, void* buf, int count);
 extern int lseek(int fd, int offset, int whence);
+extern int printf(const char *format, ...);