diff --git a/lib/tsc.js b/lib/tsc.js
index 274f67b5d0a3eba1c4472c8068e86dafcd8bb8d8..d2f4724a9b64bd6dc256c00c796dfc25f9a57f99 100644
--- a/lib/tsc.js
+++ b/lib/tsc.js
@@ -107804,7 +107804,7 @@ function updateHostForUseSourceOfProjectReferenceRedirect(host) {
   }
   function fileOrDirectoryExistsUsingSource(fileOrDirectory, isFile) {
     var _a2, _b;
-    const fileOrDirectoryExistsUsingSource2 = isFile ? (file) => fileExistsIfProjectReferenceDts(file) : (dir) => directoryExistsIfProjectReferenceDeclDir(dir);
+    const fileOrDirectoryExistsUsingSource2 = isFile ? fileExistsIfProjectReferenceDts : directoryExistsIfProjectReferenceDeclDir;
     const result = fileOrDirectoryExistsUsingSource2(fileOrDirectory);
     if (result !== void 0)
       return result;
diff --git a/lib/tsserver.js b/lib/tsserver.js
index 19f90ccd718063b95f99416b1214845517df3dcf..4a4512746886eae0db323c97ff842ed05b938b58 100644
--- a/lib/tsserver.js
+++ b/lib/tsserver.js
@@ -110146,7 +110146,7 @@ function updateHostForUseSourceOfProjectReferenceRedirect(host) {
   }
   function fileOrDirectoryExistsUsingSource(fileOrDirectory, isFile) {
     var _a2, _b;
-    const fileOrDirectoryExistsUsingSource2 = isFile ? (file) => fileExistsIfProjectReferenceDts(file) : (dir) => directoryExistsIfProjectReferenceDeclDir(dir);
+    const fileOrDirectoryExistsUsingSource2 = isFile ? fileExistsIfProjectReferenceDts : directoryExistsIfProjectReferenceDeclDir;
     const result = fileOrDirectoryExistsUsingSource2(fileOrDirectory);
     if (result !== void 0)
       return result;
diff --git a/lib/tsserverlibrary.js b/lib/tsserverlibrary.js
index 12708fe2e45fbca101912661c14ee66a7c918a86..75f0fbc67516685e4a27af71bf3897c57148ad66 100644
--- a/lib/tsserverlibrary.js
+++ b/lib/tsserverlibrary.js
@@ -110048,7 +110048,7 @@ function updateHostForUseSourceOfProjectReferenceRedirect(host) {
   }
   function fileOrDirectoryExistsUsingSource(fileOrDirectory, isFile) {
     var _a2, _b;
-    const fileOrDirectoryExistsUsingSource2 = isFile ? (file) => fileExistsIfProjectReferenceDts(file) : (dir) => directoryExistsIfProjectReferenceDeclDir(dir);
+    const fileOrDirectoryExistsUsingSource2 = isFile ? fileExistsIfProjectReferenceDts : directoryExistsIfProjectReferenceDeclDir;
     const result = fileOrDirectoryExistsUsingSource2(fileOrDirectory);
     if (result !== void 0)
       return result;
diff --git a/lib/typescript.js b/lib/typescript.js
index 5ed4b520b14c61c94239f298b2722a266f639f59..d4a8c5c9b8b3a0ddaf09b8f02ca1c3ef768da04e 100644
--- a/lib/typescript.js
+++ b/lib/typescript.js
@@ -110410,7 +110410,7 @@ function updateHostForUseSourceOfProjectReferenceRedirect(host) {
   }
   function fileOrDirectoryExistsUsingSource(fileOrDirectory, isFile) {
     var _a2, _b;
-    const fileOrDirectoryExistsUsingSource2 = isFile ? (file) => fileExistsIfProjectReferenceDts(file) : (dir) => directoryExistsIfProjectReferenceDeclDir(dir);
+    const fileOrDirectoryExistsUsingSource2 = isFile ? fileExistsIfProjectReferenceDts : directoryExistsIfProjectReferenceDeclDir;
     const result = fileOrDirectoryExistsUsingSource2(fileOrDirectory);
     if (result !== void 0)
       return result;
diff --git a/src/compiler/program.ts b/src/compiler/program.ts
index d1ff3495e006029f313abe7eca8197a9e75b693e..f03ca96b1832529cf0ee8a5dbab1b92c28ef0930 100644
--- a/src/compiler/program.ts
+++ b/src/compiler/program.ts
@@ -4463,8 +4463,8 @@ function updateHostForUseSourceOfProjectReferenceRedirect(host: HostForUseSource
 
     function fileOrDirectoryExistsUsingSource(fileOrDirectory: string, isFile: boolean): boolean {
         const fileOrDirectoryExistsUsingSource = isFile ?
-            (file: string) => fileExistsIfProjectReferenceDts(file) :
-            (dir: string) => directoryExistsIfProjectReferenceDeclDir(dir);
+            fileExistsIfProjectReferenceDts :
+            directoryExistsIfProjectReferenceDeclDir;
         // Check current directory or file
         const result = fileOrDirectoryExistsUsingSource(fileOrDirectory);
         if (result !== undefined) return result;