diff --git a/core/src/main/java/org/apache/iceberg/inmemory/InMemoryCatalog.java b/core/src/main/java/org/apache/iceberg/inmemory/InMemoryCatalog.java
index a880f94f4385..6277e7972ab9 100644
--- a/core/src/main/java/org/apache/iceberg/inmemory/InMemoryCatalog.java
+++ b/core/src/main/java/org/apache/iceberg/inmemory/InMemoryCatalog.java
@@ -18,6 +18,8 @@
  */
 package org.apache.iceberg.inmemory;
 
+import static java.util.Objects.requireNonNull;
+
 import java.io.Closeable;
 import java.io.IOException;
 import java.util.Arrays;
@@ -68,6 +70,7 @@ public class InMemoryCatalog extends BaseMetastoreViewCatalog
   private final ConcurrentMap<TableIdentifier, String> views;
   private FileIO io;
   private String catalogName;
+  private Map<String, String> properties;
   private String warehouseLocation;
   private CloseableGroup closeableGroup;
 
@@ -85,6 +88,7 @@ public String name() {
   @Override
   public void initialize(String name, Map<String, String> properties) {
     this.catalogName = name != null ? name : InMemoryCatalog.class.getSimpleName();
+    this.properties = ImmutableMap.copyOf(properties);
 
     String warehouse = properties.getOrDefault(CatalogProperties.WAREHOUSE_LOCATION, "");
     this.warehouseLocation = warehouse.replaceAll("/*$", "");
@@ -94,6 +98,12 @@ public void initialize(String name, Map<String, String> properties) {
     closeableGroup.setSuppressCloseFailure(true);
   }
 
+  @Override
+  protected Map<String, String> properties() {
+    requireNonNull(properties, "properties");
+    return properties;
+  }
+
   @Override
   protected TableOperations newTableOps(TableIdentifier tableIdentifier) {
     return new InMemoryTableOperations(io, tableIdentifier);