atoi.3: tfix

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man3/atoi.3 b/man3/atoi.3
index 33014b383dbf3285b5a50b1becdf3be8829a4c8c..d72df2c09fb54057a836d1bc41822ee39a202eba 100644 (file)
--- a/man3/atoi.3
+++ b/man3/atoi.3
@@ -50,7 +50,7 @@ Feature Test Macro Requirements for glibc (see
 .ad l
 .BR atoll ():
 .RS 4
-__ISOC99_SOURCE ||
+_ISOC99_SOURCE ||
     || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
 .RE
 .ad