diff --git a/man3/ualarm.3 b/man3/ualarm.3
index 681cbda24..b6469978e 100644
--- a/man3/ualarm.3
+++ b/man3/ualarm.3
@@ -25,7 +25,7 @@
 ualarm \- schedule signal after given number of microseconds
 .SH SYNOPSIS
 .nf
-.B "#define _XOPEN_SOURCE 500     /* Or: #define _BSD_SOURCE */
+.B "#define _XOPEN_SOURCE 500     /* Or: #define _BSD_SOURCE */"
 .B "#include <unistd.h>"
 .sp
 .BI "useconds_t ualarm(useconds_t " usecs ", useconds_t " interval );