1 files changed, 2 insertions, 0 deletions
diff --git a/man3/strfry.3 b/man3/strfry.3
index c4e84e99..8a67e1b0 100644
--- a/man3/strfry.3
+++ b/man3/strfry.3
@@ -30,6 +30,8 @@
 strfry \- randomize a string
 .SH SYNOPSIS
 .nf
+.B #define _GNU_SOURCE
+.br
 .B #include <string.h>
 .sp
 .BI "char *strfry(char *" string );