diff --git a/org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/AppServer.java b/org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/AppServer.java
index 4e27a3d35..f9f8c856b 100644
--- a/org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/AppServer.java
+++ b/org.eclipse.jgit.junit.http/src/org/eclipse/jgit/junit/http/AppServer.java
@@ -23,8 +23,8 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;
+import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentMap;
 
 import org.eclipse.jetty.http.HttpVersion;
 import org.eclipse.jetty.security.AbstractLoginService;
@@ -259,7 +259,7 @@ public ServletContextHandler authBasic(ServletContextHandler ctx,
 	static class TestMappedLoginService extends AbstractLoginService {
 		private String role;
 
-		protected final ConcurrentMap<String, UserPrincipal> users = new ConcurrentHashMap<>();
+		protected final Map<String, UserPrincipal> users = new ConcurrentHashMap<>();
 
 		TestMappedLoginService(String role) {
 			this.role = role;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/api/ArchiveCommand.java b/org.eclipse.jgit/src/org/eclipse/jgit/api/ArchiveCommand.java
index 2c01c19c5..fdf8b80cd 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/api/ArchiveCommand.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/api/ArchiveCommand.java
@@ -19,7 +19,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentMap;
 
 import org.eclipse.jgit.api.errors.GitAPIException;
 import org.eclipse.jgit.api.errors.JGitInternalException;
@@ -202,7 +201,7 @@ public FormatEntry(Format<?> format, int refcnt) {
 	 * Available archival formats (corresponding to values for
 	 * the --format= option)
 	 */
-	private static final ConcurrentMap<String, FormatEntry> formats =
+	private static final Map<String, FormatEntry> formats =
 			new ConcurrentHashMap<>();
 
 	/**
@@ -215,7 +214,7 @@ public FormatEntry(Format<?> format, int refcnt) {
 	 * @param newValue value to be associated with the key (null to remove).
 	 * @return true if the value was replaced
 	 */
-	private static <K, V> boolean replace(ConcurrentMap<K, V> map,
+	private static <K, V> boolean replace(Map<K, V> map,
 			K key, V oldValue, V newValue) {
 		if (oldValue == null && newValue == null) // Nothing to do.
 			return true;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/attributes/FilterCommandRegistry.java b/org.eclipse.jgit/src/org/eclipse/jgit/attributes/FilterCommandRegistry.java
index 2698e2303..1c9e9d7f7 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/attributes/FilterCommandRegistry.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/attributes/FilterCommandRegistry.java
@@ -12,6 +12,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 
@@ -23,7 +24,7 @@
  * @since 4.6
  */
 public class FilterCommandRegistry {
-	private static ConcurrentHashMap<String, FilterCommandFactory> filterCommandRegistry = new ConcurrentHashMap<>();
+	private static Map<String, FilterCommandFactory> filterCommandRegistry = new ConcurrentHashMap<>();
 
 	/**
 	 * Register a {@link org.eclipse.jgit.attributes.FilterCommandFactory}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/events/ListenerList.java b/org.eclipse.jgit/src/org/eclipse/jgit/events/ListenerList.java
index 32c3a1d28..476c37c1c 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/events/ListenerList.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/events/ListenerList.java
@@ -11,15 +11,15 @@
 package org.eclipse.jgit.events;
 
 import java.util.List;
+import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.CopyOnWriteArrayList;
 
 /**
  * Manages a thread-safe list of {@link org.eclipse.jgit.events.RepositoryListener}s.
  */
 public class ListenerList {
-	private final ConcurrentMap<Class<? extends RepositoryListener>, CopyOnWriteArrayList<ListenerHandle>> lists = new ConcurrentHashMap<>();
+	private final Map<Class<? extends RepositoryListener>, CopyOnWriteArrayList<ListenerHandle>> lists = new ConcurrentHashMap<>();
 
 	/**
 	 * Register a {@link org.eclipse.jgit.events.WorkingTreeModifiedListener}.
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/RepositoryCache.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/RepositoryCache.java
index 2c108de86..c1beb6f41 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/RepositoryCache.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/RepositoryCache.java
@@ -14,6 +14,7 @@
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
@@ -193,7 +194,7 @@ static void reconfigure(RepositoryCacheConfig repositoryCacheConfig) {
 		cache.configureEviction(repositoryCacheConfig);
 	}
 
-	private final ConcurrentHashMap<Key, Repository> cacheMap;
+	private final Map<Key, Repository> cacheMap;
 
 	private final Lock[] openLocks;
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/nls/NLS.java b/org.eclipse.jgit/src/org/eclipse/jgit/nls/NLS.java
index d7dd3bee5..881873de6 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/nls/NLS.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/nls/NLS.java
@@ -11,6 +11,7 @@
 package org.eclipse.jgit.nls;
 
 import java.util.Locale;
+import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 import org.eclipse.jgit.errors.TranslationBundleLoadingException;
@@ -110,7 +111,8 @@ public static void clear() {
 	}
 
 	private final Locale locale;
-	private final ConcurrentHashMap<Class, TranslationBundle> map = new ConcurrentHashMap<>();
+
+	private final Map<Class, TranslationBundle> map = new ConcurrentHashMap<>();
 
 	private NLS(Locale locale) {
 		this.locale = locale;