diff --git a/plugins/node/opentelemetry-instrumentation-mongodb/src/instrumentation.ts b/plugins/node/opentelemetry-instrumentation-mongodb/src/instrumentation.ts
index ad1780d996..2cb1720846 100644
--- a/plugins/node/opentelemetry-instrumentation-mongodb/src/instrumentation.ts
+++ b/plugins/node/opentelemetry-instrumentation-mongodb/src/instrumentation.ts
@@ -410,11 +410,11 @@ export class MongoDBInstrumentation extends InstrumentationBase<
 
     // capture parameters within the query as well if enhancedDatabaseReporting is enabled.
     const commandObj = command.query ?? command.q ?? command;
-    const dbStatementSerializer: DbStatementSerializer =
-      this._config.dbStatementSerializer ||
+    const dbStatementSerializer =
+      typeof this._config.dbStatementSerializer === 'function' ?
+      this._config.dbStatementSerializer :
       this._defaultDbStatementSerializer.bind(this);
 
-    if (typeof dbStatementSerializer === 'function') {
       safeExecuteInTheMiddle(
         () => {
           const query = dbStatementSerializer(commandObj);
@@ -427,7 +427,6 @@ export class MongoDBInstrumentation extends InstrumentationBase<
         },
         true
       );
-    }
   }
 
   private _defaultDbStatementSerializer(commandObj: Record<string, unknown>) {