diff --git a/cdm/core/src/main/java/ucar/nc2/ft2/coverage/CoverageCoordAxisBuilder.java b/cdm/core/src/main/java/ucar/nc2/ft2/coverage/CoverageCoordAxisBuilder.java
index 94df27c8f9..6d90ca4733 100644
--- a/cdm/core/src/main/java/ucar/nc2/ft2/coverage/CoverageCoordAxisBuilder.java
+++ b/cdm/core/src/main/java/ucar/nc2/ft2/coverage/CoverageCoordAxisBuilder.java
@@ -133,6 +133,10 @@ public CoverageCoordAxisBuilder setDependsOn(String dependsOn) {
   // for point: values are the points, values[npts]
   // for intervals: values are the edges, values[2*npts]: low0, high0, low1, high1
 
+  public void setMissingTolerance(double tolerance) {
+    missingTolerance = tolerance;
+  }
+
   public void setSpacingFromValues(boolean isInterval) {
     if (isInterval) {
       setSpacingFromIntervalValues();
@@ -227,7 +231,7 @@ private void setSpacingFromIntervalValues() {
     }
   }
 
-  private static final double missingTolerance = .05;
+  private double missingTolerance = .05;
 
   private boolean isRegular(Counters.Counter resol) {
     if (resol.getUnique() == 1) {
diff --git a/grib/src/main/java/ucar/nc2/grib/coverage/GribCoverageDataset.java b/grib/src/main/java/ucar/nc2/grib/coverage/GribCoverageDataset.java
index 40885ceed7..0c544ea77e 100644
--- a/grib/src/main/java/ucar/nc2/grib/coverage/GribCoverageDataset.java
+++ b/grib/src/main/java/ucar/nc2/grib/coverage/GribCoverageDataset.java
@@ -852,6 +852,7 @@ private CoverageCoordAxis makeRuntimeAuxCoord(CoordinateTimeAbstract time) {
     CoverageCoordAxisBuilder builder =
         new CoverageCoordAxisBuilder(refName, master.getUnit(), Grib.GRIB_RUNTIME, DataType.DOUBLE, AxisType.RunTime,
             atts, CoverageCoordAxis.DependenceType.dependent, time.getName(), null, length, 0, 0, 0, data, this);
+    builder.setMissingTolerance(0.0);
     builder.setSpacingFromValues(false);
 
     return new CoverageCoordAxis1D(builder);