diff --git a/kafka-connect-s3/src/main/java/io/confluent/connect/s3/S3SinkConnectorConfig.java b/kafka-connect-s3/src/main/java/io/confluent/connect/s3/S3SinkConnectorConfig.java
index 880bcf374..97a9541e7 100644
--- a/kafka-connect-s3/src/main/java/io/confluent/connect/s3/S3SinkConnectorConfig.java
+++ b/kafka-connect-s3/src/main/java/io/confluent/connect/s3/S3SinkConnectorConfig.java
@@ -17,11 +17,14 @@
 
 import com.amazonaws.ClientConfiguration;
 import com.amazonaws.auth.AWSCredentialsProvider;
+import com.amazonaws.auth.AWSStaticCredentialsProvider;
+import com.amazonaws.auth.BasicAWSCredentials;
 import com.amazonaws.auth.DefaultAWSCredentialsProviderChain;
 import com.amazonaws.regions.RegionUtils;
 import com.amazonaws.regions.Regions;
 import com.amazonaws.services.s3.model.CannedAccessControlList;
 import com.amazonaws.services.s3.model.SSEAlgorithm;
+import io.confluent.connect.storage.common.util.StringUtils;
 import org.apache.kafka.common.Configurable;
 import org.apache.kafka.common.config.AbstractConfig;
 import org.apache.kafka.common.config.ConfigDef;
@@ -787,6 +790,14 @@ public CannedAccessControlList getCannedAcl() {
     return CannedAclValidator.ACLS_BY_HEADER_VALUE.get(getString(ACL_CANNED_CONFIG));
   }
 
+  public String awsAccessKeyId() {
+    return getString(AWS_ACCESS_KEY_ID_CONFIG);
+  }
+
+  public Password awsSecretKeyId() {
+    return getPassword(AWS_SECRET_ACCESS_KEY_CONFIG);
+  }
+
   public int getPartSize() {
     return getInt(PART_SIZE_CONFIG);
   }
@@ -802,7 +813,18 @@ public AWSCredentialsProvider getCredentialsProvider() {
         configs.remove(CREDENTIALS_PROVIDER_CLASS_CONFIG.substring(
             CREDENTIALS_PROVIDER_CONFIG_PREFIX.length()
         ));
+
+        configs.put(AWS_ACCESS_KEY_ID_CONFIG, awsAccessKeyId());
+        configs.put(AWS_SECRET_ACCESS_KEY_CONFIG, awsSecretKeyId().value());
+
         ((Configurable) provider).configure(configs);
+      } else {
+        final String accessKeyId = awsAccessKeyId();
+        final String secretKey = awsSecretKeyId().value();
+        if (StringUtils.isNotBlank(accessKeyId) && StringUtils.isNotBlank(secretKey)) {
+          BasicAWSCredentials basicCredentials = new BasicAWSCredentials(accessKeyId, secretKey);
+          provider = new AWSStaticCredentialsProvider(basicCredentials);
+        }
       }
 
       return provider;
diff --git a/kafka-connect-s3/src/main/java/io/confluent/connect/s3/auth/AwsAssumeRoleCredentialsProvider.java b/kafka-connect-s3/src/main/java/io/confluent/connect/s3/auth/AwsAssumeRoleCredentialsProvider.java
index 9547098c7..2dc6b23da 100644
--- a/kafka-connect-s3/src/main/java/io/confluent/connect/s3/auth/AwsAssumeRoleCredentialsProvider.java
+++ b/kafka-connect-s3/src/main/java/io/confluent/connect/s3/auth/AwsAssumeRoleCredentialsProvider.java
@@ -17,15 +17,21 @@
 package io.confluent.connect.s3.auth;
 
 import com.amazonaws.auth.AWSCredentials;
-import com.amazonaws.auth.AWSCredentialsProvider;
+import com.amazonaws.auth.AWSStaticCredentialsProvider;
+import com.amazonaws.auth.BasicAWSCredentials;
 import com.amazonaws.auth.STSAssumeRoleSessionCredentialsProvider;
+import com.amazonaws.auth.AWSCredentialsProvider;
 import com.amazonaws.services.securitytoken.AWSSecurityTokenServiceClientBuilder;
+import io.confluent.connect.storage.common.util.StringUtils;
 import org.apache.kafka.common.Configurable;
 import org.apache.kafka.common.config.AbstractConfig;
 import org.apache.kafka.common.config.ConfigDef;
 
 import java.util.Map;
 
+import static io.confluent.connect.s3.S3SinkConnectorConfig.AWS_ACCESS_KEY_ID_CONFIG;
+import static io.confluent.connect.s3.S3SinkConnectorConfig.AWS_SECRET_ACCESS_KEY_CONFIG;
+
 /**
  * AWS credentials provider that uses the AWS Security Token Service to assume a Role and create a
  * temporary, short-lived session to use for authentication.  This credentials provider does not
@@ -59,21 +65,39 @@ public class AwsAssumeRoleCredentialsProvider implements AWSCredentialsProvider,
   private String roleExternalId;
   private String roleSessionName;
 
+  private BasicAWSCredentials basicCredentials;
+
   @Override
   public void configure(Map<String, ?> configs) {
     AbstractConfig config = new AbstractConfig(STS_CONFIG_DEF, configs);
     roleArn = config.getString(ROLE_ARN_CONFIG);
     roleExternalId = config.getString(ROLE_EXTERNAL_ID_CONFIG);
     roleSessionName = config.getString(ROLE_SESSION_NAME_CONFIG);
+    final String accessKeyId = (String) configs.get(AWS_ACCESS_KEY_ID_CONFIG);
+    final String secretKey = (String) configs.get(AWS_SECRET_ACCESS_KEY_CONFIG);
+    if (StringUtils.isNotBlank(accessKeyId) && StringUtils.isNotBlank(secretKey)) {
+      basicCredentials = new BasicAWSCredentials(accessKeyId, secretKey);
+    } else {
+      basicCredentials = null;
+    }
   }
 
   @Override
   public AWSCredentials getCredentials() {
-    return new STSAssumeRoleSessionCredentialsProvider.Builder(roleArn, roleSessionName)
-        .withStsClient(AWSSecurityTokenServiceClientBuilder.defaultClient())
-        .withExternalId(roleExternalId)
-        .build()
-        .getCredentials();
+    if (basicCredentials != null) {
+      return new STSAssumeRoleSessionCredentialsProvider.Builder(roleArn, roleSessionName)
+              .withStsClient(AWSSecurityTokenServiceClientBuilder.standard()
+                 .withCredentials(new AWSStaticCredentialsProvider(basicCredentials)).build())
+              .withExternalId(roleExternalId)
+              .build()
+              .getCredentials();
+    } else {
+      return new STSAssumeRoleSessionCredentialsProvider.Builder(roleArn, roleSessionName)
+            .withStsClient(AWSSecurityTokenServiceClientBuilder.defaultClient())
+            .withExternalId(roleExternalId)
+            .build()
+            .getCredentials();
+    }
   }
 
   @Override
diff --git a/kafka-connect-s3/src/main/java/io/confluent/connect/s3/storage/S3Storage.java b/kafka-connect-s3/src/main/java/io/confluent/connect/s3/storage/S3Storage.java
index 206741324..6e01c4559 100644
--- a/kafka-connect-s3/src/main/java/io/confluent/connect/s3/storage/S3Storage.java
+++ b/kafka-connect-s3/src/main/java/io/confluent/connect/s3/storage/S3Storage.java
@@ -19,8 +19,6 @@
 import com.amazonaws.PredefinedClientConfigurations;
 import com.amazonaws.SdkClientException;
 import com.amazonaws.auth.AWSCredentialsProvider;
-import com.amazonaws.auth.AWSStaticCredentialsProvider;
-import com.amazonaws.auth.BasicAWSCredentials;
 import com.amazonaws.client.builder.AwsClientBuilder;
 import com.amazonaws.regions.Regions;
 import com.amazonaws.retry.PredefinedBackoffStrategies;
@@ -47,8 +45,6 @@
 import io.confluent.connect.storage.Storage;
 import io.confluent.connect.storage.common.util.StringUtils;
 
-import static io.confluent.connect.s3.S3SinkConnectorConfig.AWS_ACCESS_KEY_ID_CONFIG;
-import static io.confluent.connect.s3.S3SinkConnectorConfig.AWS_SECRET_ACCESS_KEY_CONFIG;
 import static io.confluent.connect.s3.S3SinkConnectorConfig.REGION_CONFIG;
 import static io.confluent.connect.s3.S3SinkConnectorConfig.S3_PATH_STYLE_ACCESS_ENABLED_CONFIG;
 import static io.confluent.connect.s3.S3SinkConnectorConfig.S3_PROXY_URL_CONFIG;
@@ -174,17 +170,8 @@ protected RetryPolicy newFullJitterRetryPolicy(S3SinkConnectorConfig config) {
   }
 
   protected AWSCredentialsProvider newCredentialsProvider(S3SinkConnectorConfig config) {
-    final String accessKeyId = config.getString(AWS_ACCESS_KEY_ID_CONFIG);
-    final String secretKey = config.getPassword(AWS_SECRET_ACCESS_KEY_CONFIG).value();
-    if (StringUtils.isNotBlank(accessKeyId) && StringUtils.isNotBlank(secretKey)) {
-      log.info("Returning new credentials provider using the access key id and "
-          + "the secret access key that were directly supplied through the connector's "
-          + "configuration");
-      BasicAWSCredentials basicCredentials = new BasicAWSCredentials(accessKeyId, secretKey);
-      return new AWSStaticCredentialsProvider(basicCredentials);
-    }
-    log.info(
-        "Returning new credentials provider based on the configured credentials provider class");
+    log.info("Returning new credentials provider based on the configured "
+           + "credentials provider class");
     return config.getCredentialsProvider();
   }