diff --git a/flow/src/org/labkey/flow/FlowExperimentListener.java b/flow/src/org/labkey/flow/FlowExperimentListener.java
index 04a2624b9..48c6c75ff 100644
--- a/flow/src/org/labkey/flow/FlowExperimentListener.java
+++ b/flow/src/org/labkey/flow/FlowExperimentListener.java
@@ -15,6 +15,7 @@
  */
 package org.labkey.flow;
 
+import org.jetbrains.annotations.Nullable;
 import org.labkey.api.data.Container;
 import org.labkey.api.data.DbScope;
 import org.labkey.api.exp.api.ExpMaterial;
@@ -28,7 +29,7 @@
 public class FlowExperimentListener implements ExperimentListener
 {
     @Override
-    public void beforeMaterialDelete(List<? extends ExpMaterial> materials, Container container, User user)
+    public void beforeMaterialDelete(List<? extends ExpMaterial> materials, Container container, User user, @Nullable String auditUserComment)
     {
         DbScope.Transaction tx = ExperimentService.get().getSchema().getScope().getCurrentTransaction();
         tx.addCommitTask(() -> FlowManager.get().flowObjectModified(), DbScope.CommitTaskOption.POSTCOMMIT);
diff --git a/microarray/src/org/labkey/microarray/matrix/ExpressionMatrixExperimentListener.java b/microarray/src/org/labkey/microarray/matrix/ExpressionMatrixExperimentListener.java
index 366985600..de72df3fe 100644
--- a/microarray/src/org/labkey/microarray/matrix/ExpressionMatrixExperimentListener.java
+++ b/microarray/src/org/labkey/microarray/matrix/ExpressionMatrixExperimentListener.java
@@ -15,6 +15,7 @@
  */
 package org.labkey.microarray.matrix;
 
+import org.jetbrains.annotations.Nullable;
 import org.labkey.api.data.Container;
 import org.labkey.api.data.SQLFragment;
 import org.labkey.api.data.SqlExecutor;
@@ -35,7 +36,7 @@
 public class ExpressionMatrixExperimentListener implements ExperimentListener
 {
     @Override
-    public void beforeMaterialDelete(List<? extends ExpMaterial> materials, Container container, User user)
+    public void beforeMaterialDelete(List<? extends ExpMaterial> materials, Container container, User user, @Nullable String auditUserComment)
     {
         SqlDialect d = MicroarrayUserSchema.getSchema().getSqlDialect();
         SqlExecutor sqlExecutor = new SqlExecutor(MicroarrayUserSchema.getSchema());