diff --git a/lib/internal/source_map/source_map_cache_map.js b/lib/internal/source_map/source_map_cache_map.js
index dcacfd9bdbf269..10561acffc4bab 100644
--- a/lib/internal/source_map/source_map_cache_map.js
+++ b/lib/internal/source_map/source_map_cache_map.js
@@ -13,6 +13,9 @@ const {
     source_map_data_private_symbol,
   },
 } = internalBinding('util');
+let debug = require('internal/util/debuglog').debuglog('source_map', (fn) => {
+  debug = fn;
+});
 
 /**
  * Specialized map of WeakRefs to module instances that caches source map
@@ -46,6 +49,7 @@ class SourceMapCacheMap {
     ArrayPrototypeForEach(keys, (key) => {
       const ref = this.#weakModuleMap.get(key);
       if (ref && ref.deref() === undefined) {
+        debug(`Cleanup obsolete source map cache entry with key: ${key}`);
         this.#weakModuleMap.delete(key);
       }
     });
diff --git a/test/fixtures/source-map/output/source_map_sourcemapping_url_string.js b/test/fixtures/source-map/output/source_map_sourcemapping_url_string.js
index 8dca7a35bfe7b9..1890e6e0b6d429 100644
--- a/test/fixtures/source-map/output/source_map_sourcemapping_url_string.js
+++ b/test/fixtures/source-map/output/source_map_sourcemapping_url_string.js
@@ -7,7 +7,5 @@ Error.stackTraceLimit = 2;
 try {
   require('../typescript-sourcemapping_url_string');
 } catch (err) {
-  setTimeout(() => {
-    console.info(err);
-  }, 10);
+  console.info(err);
 }
diff --git a/test/fixtures/source-map/output/source_map_throw_catch.js b/test/fixtures/source-map/output/source_map_throw_catch.js
index c49ffcff865907..75ce228c918870 100644
--- a/test/fixtures/source-map/output/source_map_throw_catch.js
+++ b/test/fixtures/source-map/output/source_map_throw_catch.js
@@ -7,7 +7,5 @@ Error.stackTraceLimit = 2;
 try {
   require('../typescript-throw');
 } catch (err) {
-  setTimeout(() => {
-    console.info(err);
-  }, 10);
+  console.info(err);
 }