diff --git a/ChangeLog b/ChangeLog
index 4c499513..38427166 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,9 +2,9 @@ NEW IN WAF 1.9.3
 ----------------
 * Enable configuration task class lookup in conf.multicheck
 * Enable individual output lines in conf.multicheck
+* Parallel configuration tests can use any build function
 * Updated examples for stripping executables
-* More documentation
-* Qt 5.7 detection
+* Qt 5.7 detection of -std=c++11
 
 NEW IN WAF 1.9.2
 ----------------
diff --git a/demos/c/wscript b/demos/c/wscript
index 9f0aed93..66a9cc31 100644
--- a/demos/c/wscript
+++ b/demos/c/wscript
@@ -43,7 +43,7 @@ def configure(conf):
 
 	conf.multicheck(
 		{'header_name':'stdio.h', 'msg':'... stdio'},
-		{'header_name':'unistd.h', 'msg':'... unistd'},
+		{'header_name':'ueistd.h', 'msg':'... unistd', 'mandatory':False},
 		{'header_name':'stdlib.h', 'msg':'... stdlib', 'okmsg': 'aye', 'errmsg': 'nope'},
 		{'func': test_build, 'msg':'... testing an arbitrary build function', 'okmsg':'ok'},
 		msg       = 'Checking for headers in parallel',