diff --git a/reactos/lib/sdk/crt/printf/streamout.c b/reactos/lib/sdk/crt/printf/streamout.c
index 3933ed94336..69696406a80 100644
--- a/reactos/lib/sdk/crt/printf/streamout.c
+++ b/reactos/lib/sdk/crt/printf/streamout.c
@@ -17,7 +17,7 @@
 #define streamout wstreamout
 #define format_float format_floatw
 #define _flsbuf _flswbuf
-int __cdecl _flwsbuf(int ch, FILE *stream);
+int __cdecl _flswbuf(int ch, FILE *stream);
 #endif
 
 #define MB_CUR_MAX 10