diff --git a/io/io_passfd.c b/io/io_passfd.c
index 50de714..48dac81 100644
--- a/io/io_passfd.c
+++ b/io/io_passfd.c
@@ -8,10 +8,10 @@ int io_passfd(int64 sock,int64 fd) {
 #else
 
 #ifdef __OpenBSD__
-#warn This is a HORRIBLE kludge around yet another thing OpenBSD broke
-#warn If they make it possible to do file descriptor passing with
-#warn _XOPEN_SOURCE defined, please send me an email so I can remove this.
-#warn _XOPEN_SOURCE needs to be defined for this to work on Solaris.
+#warning This is a HORRIBLE kludge around yet another thing OpenBSD broke
+#warning If they make it possible to do file descriptor passing with
+#warning _XOPEN_SOURCE defined, please send me an email so I can remove this.
+#warning _XOPEN_SOURCE needs to be defined for this to work on Solaris.
 #else
 #define _XOPEN_SOURCE
 #define _XOPEN_SOURCE_EXTENDED 1
diff --git a/io/io_receivefd.c b/io/io_receivefd.c
index 7c5a544..61f2cef 100644
--- a/io/io_receivefd.c
+++ b/io/io_receivefd.c
@@ -8,10 +8,10 @@ int64 io_receivefd(int64 sock) {
 #else
 
 #ifdef __OpenBSD__
-#warn This is a HORRIBLE kludge around yet another thing OpenBSD broke
-#warn If they make it possible to do file descriptor passing with
-#warn _XOPEN_SOURCE defined, please send me an email so I can remove this.
-#warn _XOPEN_SOURCE needs to be defined for this to work on Solaris.
+#warning This is a HORRIBLE kludge around yet another thing OpenBSD broke
+#warning If they make it possible to do file descriptor passing with
+#warning _XOPEN_SOURCE defined, please send me an email so I can remove this.
+#warning _XOPEN_SOURCE needs to be defined for this to work on Solaris.
 #else
 #define _XOPEN_SOURCE
 #define _XOPEN_SOURCE_EXTENDED 1