diff --git a/man3/ualarm.3 b/man3/ualarm.3
index 54bd783da..b24125b93 100644
--- a/man3/ualarm.3
+++ b/man3/ualarm.3
@@ -49,7 +49,7 @@ _BSD_SOURCE ||
 .TP 4
 .fi
 Before glibc 2.12:
-_BSD_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
+_BSD_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE\ &&\ _XOPEN_SOURCE_EXTENDED
 .PD
 .RE
 .ad b