diff --git a/test_problems/diamondSurf/runDiamond.cpp b/test_problems/diamondSurf/runDiamond.cpp
index d52f84005..888d6cfe5 100644
--- a/test_problems/diamondSurf/runDiamond.cpp
+++ b/test_problems/diamondSurf/runDiamond.cpp
@@ -41,7 +41,7 @@ static void printUsage()
 using namespace Cantera;
 
 void printDbl(double val) {
-  if (fabs(val) < 2.0E-17) {
+  if (fabs(val) < 5.0E-17) {
     cout << " nil";
   } else {
     cout << val;