# Node ID f07dbaea0ba36b174659cb8fe467193fb739f447
# Parent  a0cb57e1c072965dcdd51465beff37b264b41424
diff --git a/src/unittest/circletest.cc b/src/unittest/circletest.cc
--- a/src/unittest/circletest.cc
+++ b/src/unittest/circletest.cc
@@ -28,6 +28,7 @@
  * Authors: Nathan Binkert
  */
 
+#include <cassert>
 #include <fcntl.h>
 #include <unistd.h>
 
@@ -56,12 +57,12 @@
     for (int count = 0; count < 100; count++)
         buf.write(strings[count % num_strings]);
     buf.read(STDOUT_FILENO);
-    write(STDOUT_FILENO, "<\n", 2);
+    assert(write(STDOUT_FILENO, "<\n", 2) != -1);
 
     for (int count = 0; count < 100; count++)
         buf.write(strings[count % num_strings]);
     buf.read(STDOUT_FILENO, 100);
-    write(STDOUT_FILENO, "<\n", 2);
+    assert(write(STDOUT_FILENO, "<\n", 2) != -1);
 
     buf.flush();
     buf.write("asdfa asdf asd fasdf asdf\n");
@@ -72,5 +73,5 @@
     buf.write("");
     buf.write("");
     buf.read(STDOUT_FILENO);
-    write(STDOUT_FILENO, "<\n", 2);
+    assert(write(STDOUT_FILENO, "<\n", 2) != -1);
 }