diff --git a/src/libCom/test/epicsTimerTest.cpp b/src/libCom/test/epicsTimerTest.cpp
index aebf3f066..55870ed2d 100644
--- a/src/libCom/test/epicsTimerTest.cpp
+++ b/src/libCom/test/epicsTimerTest.cpp
@@ -112,10 +112,9 @@ double delayVerify::checkError () const
     double actualDelay =  this->expireStamp - this->beginStamp;
     double measuredError = actualDelay - this->expectedDelay;
     double percentError = 100.0 * fabs ( measuredError ) / this->expectedDelay;
-    if ( ! testOk ( percentError < messageThresh, "%f < %f", percentError, messageThresh ) ) {
-        testDiag ( "delay = %f s, error = %f s (%.1f %%)", 
-            this->expectedDelay, measuredError, percentError );
-    }
+    testOk ( percentError < messageThresh, "%f < %f, delay = %f s, error = %f s (%.1f %%)",
+             percentError, messageThresh,
+             this->expectedDelay, measuredError, percentError  );
     return measuredError;
 }