diff --git a/src/fd_control.c b/src/fd_control.c
index 43aebf59c9f3d3ac27f519be692c4d8903986fe9..78e036f515a2aabd76b5f6bba70830fbcf9b78a6 100644
--- a/src/fd_control.c
+++ b/src/fd_control.c
@@ -46,7 +46,7 @@ void set_nonblocking(int fd,int which)
 #ifdef USE_FCNTL_FNDELAY
   fcntl(fd, F_SETFL, which?FNDELAY:0);
 #else
-#error Don't know how to set your filedescriptors nonblocking.
+#error Don not know how to set your filedescriptors nonblocking.
 #endif
 #endif
 #endif