diff --git a/src/compiler/moduleNameResolver.ts b/src/compiler/moduleNameResolver.ts
index a374e86619..1593e630b6 100644
--- a/src/compiler/moduleNameResolver.ts
+++ b/src/compiler/moduleNameResolver.ts
@@ -201,7 +201,7 @@ namespace ts {
         let resolvedTypeReferenceDirective: ResolvedTypeReferenceDirective | undefined;
         if (resolved) {
             if (!options.preserveSymlinks) {
-                resolved = realpath(resolved, host, traceEnabled);
+                resolved = realPath(resolved, host, traceEnabled);
             }
 
             if (traceEnabled) {
@@ -741,7 +741,7 @@ namespace ts {
 
                 let resolvedValue = resolved.value;
                 if (!compilerOptions.preserveSymlinks) {
-                    resolvedValue = resolvedValue && { ...resolved.value, path: realpath(resolved.value.path, host, traceEnabled), extension: resolved.value.extension };
+                    resolvedValue = resolvedValue && { ...resolved.value, path: realPath(resolved.value.path, host, traceEnabled), extension: resolved.value.extension };
                 }
                 // For node_modules lookups, get the real path so that multiple accesses to an `npm link`-ed module do not create duplicate files.
                 return { value: resolvedValue && { resolved: resolvedValue, isExternalLibraryImport: true } };
@@ -754,7 +754,7 @@ namespace ts {
         }
     }
 
-    function realpath(path: string, host: ModuleResolutionHost, traceEnabled: boolean): string {
+    function realPath(path: string, host: ModuleResolutionHost, traceEnabled: boolean): string {
         if (!host.realpath) {
             return path;
         }