diff --git a/src/crypto/OlmDevice.js b/src/crypto/OlmDevice.js
index eed0a0833..cd04f785f 100644
--- a/src/crypto/OlmDevice.js
+++ b/src/crypto/OlmDevice.js
@@ -16,7 +16,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {getPrefixedLogger, logger} from '../logger';
+import {logger} from '../logger';
 import {IndexedDBCryptoStore} from './store/indexeddb-crypto-store';
 import * as algorithms from './algorithms';
 
@@ -545,7 +545,7 @@ OlmDevice.prototype.createOutboundSession = async function(
                 }
             });
         },
-        getPrefixedLogger("[createOutboundSession]"),
+        logger.withPrefix("[createOutboundSession]"),
     );
     return newSessionId;
 };
@@ -606,7 +606,7 @@ OlmDevice.prototype.createInboundSession = async function(
                 }
             });
         },
-        getPrefixedLogger("[createInboundSession]"),
+        logger.withPrefix("[createInboundSession]"),
     );
 
     return result;
@@ -621,7 +621,7 @@ OlmDevice.prototype.createInboundSession = async function(
  * @return {Promise<string[]>}  a list of known session ids for the device
  */
 OlmDevice.prototype.getSessionIdsForDevice = async function(theirDeviceIdentityKey) {
-    const log = getPrefixedLogger("[getSessionIdsForDevice]");
+    const log = logger.withPrefix("[getSessionIdsForDevice]");
 
     if (this._sessionsInProgress[theirDeviceIdentityKey]) {
         log.debug(`Waiting for Olm session for ${theirDeviceIdentityKey} to be created`);
@@ -705,7 +705,7 @@ OlmDevice.prototype.getSessionIdForDevice = async function(
  * @return {Array.<{sessionId: string, hasReceivedMessage: Boolean}>}
  */
 OlmDevice.prototype.getSessionInfoForDevice = async function(deviceIdentityKey, nowait) {
-    const log = getPrefixedLogger("[getSessionInfoForDevice]");
+    const log = logger.withPrefix("[getSessionInfoForDevice]");
 
     if (this._sessionsInProgress[deviceIdentityKey] && !nowait) {
         log.debug(`Waiting for Olm session for ${deviceIdentityKey} to be created`);
@@ -769,7 +769,7 @@ OlmDevice.prototype.encryptMessage = async function(
                 this._saveSession(theirDeviceIdentityKey, sessionInfo, txn);
             });
         },
-        getPrefixedLogger("[encryptMessage]"),
+        logger.withPrefix("[encryptMessage]"),
     );
     return res;
 };
@@ -803,7 +803,7 @@ OlmDevice.prototype.decryptMessage = async function(
                 this._saveSession(theirDeviceIdentityKey, sessionInfo, txn);
             });
         },
-        getPrefixedLogger("[decryptMessage]"),
+        logger.withPrefix("[decryptMessage]"),
     );
     return payloadString;
 };
@@ -835,7 +835,7 @@ OlmDevice.prototype.matchesSession = async function(
                 matches = sessionInfo.session.matches_inbound(ciphertext);
             });
         },
-        getPrefixedLogger("[matchesSession]"),
+        logger.withPrefix("[matchesSession]"),
     );
     return matches;
 };
@@ -1106,7 +1106,7 @@ OlmDevice.prototype.addInboundGroupSession = async function(
                 },
             );
         },
-        getPrefixedLogger("[addInboundGroupSession]"),
+        logger.withPrefix("[addInboundGroupSession]"),
     );
 };
 
@@ -1277,7 +1277,7 @@ OlmDevice.prototype.decryptGroupMessage = async function(
                 },
             );
         },
-        getPrefixedLogger("[decryptGroupMessage]"),
+        logger.withPrefix("[decryptGroupMessage]"),
     );
 
     if (error) {
@@ -1323,7 +1323,7 @@ OlmDevice.prototype.hasInboundSessionKeys = async function(roomId, senderKey, se
                 },
             );
         },
-        getPrefixedLogger("[hasInboundSessionKeys]"),
+        logger.withPrefix("[hasInboundSessionKeys]"),
     );
 
     return result;
@@ -1383,7 +1383,7 @@ OlmDevice.prototype.getInboundGroupSessionKey = async function(
                 },
             );
         },
-        getPrefixedLogger("[getInboundGroupSessionKey]"),
+        logger.withPrefix("[getInboundGroupSessionKey]"),
     );
 
     return result;
diff --git a/src/crypto/algorithms/megolm.js b/src/crypto/algorithms/megolm.js
index 66694bedf..7ea048d2b 100644
--- a/src/crypto/algorithms/megolm.js
+++ b/src/crypto/algorithms/megolm.js
@@ -22,7 +22,7 @@ limitations under the License.
  * @module crypto/algorithms/megolm
  */
 
-import {getPrefixedLogger, logger} from '../../logger';
+import {logger} from '../../logger';
 import * as utils from "../../utils";
 import {polyfillSuper} from "../../utils";
 import * as olmlib from "../olmlib";
@@ -736,7 +736,7 @@ MegolmEncryption.prototype._shareKeyWithDevices = async function(
     logger.debug(`Ensuring Olm sessions for devices in ${this._roomId}`);
     const devicemap = await olmlib.ensureOlmSessionsForDevices(
         this._olmDevice, this._baseApis, devicesByUser, otkTimeout, failedServers,
-        getPrefixedLogger(`[${this._roomId}]`),
+        logger.withPrefix(`[${this._roomId}]`),
     );
     logger.debug(`Ensured Olm sessions for devices in ${this._roomId}`);
 
diff --git a/src/logger.ts b/src/logger.ts
index 8357c70c0..4a6b96158 100644
--- a/src/logger.ts
+++ b/src/logger.ts
@@ -59,17 +59,27 @@ log.methodFactory = function(methodName, logLevel, loggerName) {
  * Drop-in replacement for <code>console</code> using {@link https://www.npmjs.com/package/loglevel|loglevel}.
  * Can be tailored down to specific use cases if needed.
  */
-export const logger = log.getLogger(DEFAULT_NAMESPACE);
+export const logger: PrefixedLogger = log.getLogger(DEFAULT_NAMESPACE);
 logger.setLevel(log.levels.DEBUG);
 
 interface PrefixedLogger extends Logger {
-    prefix?: any;
+    withPrefix?: (prefix: string) => PrefixedLogger;
+    prefix?: string;
 }
 
-export function getPrefixedLogger(prefix): PrefixedLogger {
+function extendLogger(logger: PrefixedLogger) {
+    logger.withPrefix = function(prefix: string) {
+        return getPrefixedLogger(this.prefix + prefix);
+    };
+}
+
+extendLogger(logger);
+
+function getPrefixedLogger(prefix): PrefixedLogger {
     const prefixLogger: PrefixedLogger = log.getLogger(`${DEFAULT_NAMESPACE}-${prefix}`);
     if (prefixLogger.prefix !== prefix) {
         // Only do this setup work the first time through, as loggers are saved by name.
+        extendLogger(prefixLogger);
         prefixLogger.prefix = prefix;
         prefixLogger.setLevel(log.levels.DEBUG);
     }