diff --git a/reactos/include/ndk/rtlfuncs.h b/reactos/include/ndk/rtlfuncs.h
index b04633f05dd..71d23b066a0 100644
--- a/reactos/include/ndk/rtlfuncs.h
+++ b/reactos/include/ndk/rtlfuncs.h
@@ -2507,6 +2507,16 @@ RtlDosPathNameToNtPathName_U(
     OUT PRTL_RELATIVE_NAME_U DirectoryInfo
 );
 
+NTSYSAPI
+BOOLEAN
+NTAPI
+RtlDosPathNameToRelativeNtPathName_U(
+    IN PCWSTR DosName,
+    OUT PUNICODE_STRING NtName,
+    OUT PCWSTR * PartName,
+    OUT PRTL_RELATIVE_NAME_U RelativeName
+);
+
 NTSYSAPI
 NTSTATUS
 NTAPI
@@ -2539,14 +2549,14 @@ NTSYSAPI
 ULONG
 NTAPI
 RtlIsDosDeviceName_U(
-    IN PWSTR Name
+    IN PCWSTR Name
 );
 
 NTSYSAPI
 ULONG
 NTAPI
 RtlIsDosDeviceName_Ustr(
-    IN PUNICODE_STRING Name
+    IN PCUNICODE_STRING Name
 );
 
 
diff --git a/reactos/lib/rtl/path.c b/reactos/lib/rtl/path.c
index 0298b14c313..4b6e62965ed 100644
--- a/reactos/lib/rtl/path.c
+++ b/reactos/lib/rtl/path.c
@@ -43,7 +43,7 @@ const UNICODE_STRING RtlpDosNULDevice = RTL_CONSTANT_STRING(L"NUL");
 
 ULONG
 NTAPI
-RtlIsDosDeviceName_Ustr(IN PUNICODE_STRING PathString)
+RtlIsDosDeviceName_Ustr(IN PCUNICODE_STRING PathString)
 {
     UNICODE_STRING PathCopy;
     PWCHAR Start, End;
@@ -851,7 +851,7 @@ RtlDetermineDosPathNameType_U(IN PCWSTR Path)
  */
 ULONG
 NTAPI
-RtlIsDosDeviceName_U(IN PWSTR Path)
+RtlIsDosDeviceName_U(IN PCWSTR Path)
 {
     UNICODE_STRING PathString;
     NTSTATUS Status;
@@ -1418,7 +1418,7 @@ RtlDosPathNameToNtPathName_U_WithStatus(IN PCWSTR DosName,
  */
 BOOLEAN
 NTAPI
-RtlDosPathNameToRelativeNtPathName_U(IN PWSTR DosName,
+RtlDosPathNameToRelativeNtPathName_U(IN PCWSTR DosName,
                                      OUT PUNICODE_STRING NtName,
                                      OUT PCWSTR *PartName,
                                      OUT PRTL_RELATIVE_NAME_U RelativeName)
@@ -1437,7 +1437,7 @@ RtlDosPathNameToRelativeNtPathName_U(IN PWSTR DosName,
  */
 NTSTATUS
 NTAPI
-RtlDosPathNameToRelativeNtPathName_U_WithStatus(IN PWSTR DosName,
+RtlDosPathNameToRelativeNtPathName_U_WithStatus(IN PCWSTR DosName,
                                                 OUT PUNICODE_STRING NtName,
                                                 OUT PCWSTR *PartName,
                                                 OUT PRTL_RELATIVE_NAME_U RelativeName)