diff --git a/packages/react-client/src/ReactFlightClient.js b/packages/react-client/src/ReactFlightClient.js
index 5f49f06e2f234..0e8fad24823e2 100644
--- a/packages/react-client/src/ReactFlightClient.js
+++ b/packages/react-client/src/ReactFlightClient.js
@@ -2275,12 +2275,12 @@ function createFakeFunction<T>(
       '\n//# sourceURL=rsc://React/' +
       encodeURIComponent(environmentName) +
       '/' +
-      filename +
+      encodeURI(filename) +
       '?' +
       fakeFunctionIdx++;
     code += '\n//# sourceMappingURL=' + sourceMap;
   } else if (filename) {
-    code += '\n//# sourceURL=' + filename;
+    code += '\n//# sourceURL=' + encodeURI(filename);
   } else {
     code += '\n//# sourceURL=<anonymous>';
   }
diff --git a/packages/react-client/src/__tests__/ReactFlight-test.js b/packages/react-client/src/__tests__/ReactFlight-test.js
index cd54e4a344f69..139a75f12982f 100644
--- a/packages/react-client/src/__tests__/ReactFlight-test.js
+++ b/packages/react-client/src/__tests__/ReactFlight-test.js
@@ -1363,7 +1363,7 @@ describe('ReactFlight', () => {
             )
               ? expect.stringContaining(
                   'Error: This is an error\n' +
-                    '    at eval (eval at testFunction (eval at createFakeFunction (**), <anonymous>:1:35)\n' +
+                    '    at eval (eval at testFunction (inspected-page.html:29:11),%20%3Canonymous%3E:1:35)\n' +
                     '    at ServerComponentError (file://~/(some)(really)(exotic-directory)/ReactFlight-test.js:1166:19)\n' +
                     '    at <anonymous> (file:///testing.js:42:3)\n' +
                     '    at <anonymous> (file:///testing.js:42:3)\n' +
@@ -1371,7 +1371,7 @@ describe('ReactFlight', () => {
                 )
               : expect.stringContaining(
                   'Error: This is an error\n' +
-                    '    at eval (eval at testFunction (inspected-page.html:29:11), <anonymous>:1:10)\n' +
+                    '    at eval (eval at testFunction (inspected-page.html:29:11),%20%3Canonymous%3E:1:10)\n' +
                     '    at ServerComponentError (file://~/(some)(really)(exotic-directory)/ReactFlight-test.js:1166:19)\n' +
                     '    at file:///testing.js:42:3\n' +
                     '    at file:///testing.js:42:3\n' +