diff --git a/src/os/win32/ngx_files.c b/src/os/win32/ngx_files.c
index ebb06a0..6775dc7 100644
--- a/src/os/win32/ngx_files.c
+++ b/src/os/win32/ngx_files.c
@@ -426,11 +426,11 @@
 }
 
 
-char *
+u_char *
 ngx_realpath(u_char *path, u_char *resolved)
 {
     /* STUB */
-    return (char *) path;
+    return path;
 }
 
 
diff --git a/src/os/win32/ngx_files.h b/src/os/win32/ngx_files.h
index f567f19..a462473 100644
--- a/src/os/win32/ngx_files.h
+++ b/src/os/win32/ngx_files.h
@@ -177,7 +177,7 @@
 #define ngx_filename_cmp(s1, s2, n) _strnicmp((char *) s1, (char *) s2, n)
 
 
-char *ngx_realpath(u_char *path, u_char *resolved);
+u_char *ngx_realpath(u_char *path, u_char *resolved);
 #define ngx_realpath_n              ""
 #define ngx_getcwd(buf, size)       GetCurrentDirectory(size, (char *) buf)
 #define ngx_getcwd_n                "GetCurrentDirectory()"