diff --git a/lib/bind/irs/gai_strerror.c b/lib/bind/irs/gai_strerror.c
index 5ab8eac22c..c487e68551 100644
--- a/lib/bind/irs/gai_strerror.c
+++ b/lib/bind/irs/gai_strerror.c
@@ -51,7 +51,7 @@ const char *
 gai_strerror(int ecode) {
 #ifndef DO_PTHREADS
 	static char buf[EAI_BUFSIZE];
-#else /* DO_PTHREADS */
+#else	/* DO_PTHREADS */
 	static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
 	static pthread_key_t key;
 	static int once = 0;