diff --git a/reactos/base/system/smss/pagefile.c b/reactos/base/system/smss/pagefile.c
index 889dbeb3a88..44f8d54408c 100644
--- a/reactos/base/system/smss/pagefile.c
+++ b/reactos/base/system/smss/pagefile.c
@@ -160,10 +160,10 @@ SmpCreatePagingFileDescriptor(IN PUNICODE_STRING PageFileToken)
             {
                 /* Use the rest of the arguments as a maximum size */
                 SecondArgument.Buffer = &Arguments.Buffer[i];
-                SecondArgument.Length = Arguments.Length -
-                                        i * sizeof(WCHAR);
-                SecondArgument.MaximumLength = Arguments.MaximumLength -
-                                               i * sizeof(WCHAR);
+                SecondArgument.Length = (USHORT)(Arguments.Length -
+                                        i * sizeof(WCHAR));
+                SecondArgument.MaximumLength = (USHORT)(Arguments.MaximumLength -
+                                               i * sizeof(WCHAR));
                 Status = RtlUnicodeStringToInteger(&SecondArgument, 0, &MaxSize);
                 if (!NT_SUCCESS(Status))
                 {
diff --git a/reactos/base/system/smss/smutil.c b/reactos/base/system/smss/smutil.c
index e50f2ff3f7a..4295be9ddf5 100644
--- a/reactos/base/system/smss/smutil.c
+++ b/reactos/base/system/smss/smutil.c
@@ -213,14 +213,14 @@ SmpParseToken(IN PUNICODE_STRING Input,
         if (!Token->Buffer) return STATUS_NO_MEMORY;
 
         /* Fill in the unicode string to hold it */
-        Token->MaximumLength = TokenLength + sizeof(UNICODE_NULL);
-        Token->Length = TokenLength;
+        Token->MaximumLength = (USHORT)(TokenLength + sizeof(UNICODE_NULL));
+        Token->Length = (USHORT)TokenLength;
         RtlCopyMemory(Token->Buffer, p, TokenLength);
         Token->Buffer[TokenLength / sizeof(WCHAR)] = UNICODE_NULL;
     }
 
     /* Modify the input string with the position of where the next token begins */
-    Input->Length -= (ULONG_PTR)pp - (ULONG_PTR)Input->Buffer;
+    Input->Length -= (USHORT)((ULONG_PTR)pp - (ULONG_PTR)Input->Buffer);
     Input->Buffer = pp;
     return STATUS_SUCCESS;
 }
@@ -256,7 +256,7 @@ SmpParseCommandLine(IN PUNICODE_STRING CommandLine,
                  sizeof(L"\\system32;");
         RtlInitEmptyUnicodeString(&FullPathString,
                                   RtlAllocateHeap(SmpHeap, SmBaseTag, Length),
-                                  Length);
+                                  (USHORT)Length);
         if (FullPathString.Buffer)
         {
             /* Append the root, system32;, and then the current library path */
@@ -308,7 +308,7 @@ SmpParseCommandLine(IN PUNICODE_STRING CommandLine,
     Length = PAGE_SIZE;
     RtlInitEmptyUnicodeString(&PathString,
                               RtlAllocateHeap(SmpHeap, SmBaseTag, Length),
-                              Length);
+                              (USHORT)Length);
     if (!PathString.Buffer)
     {
         /* Fail if we have no memory for this */
@@ -329,7 +329,7 @@ SmpParseCommandLine(IN PUNICODE_STRING CommandLine,
         Length = PathString.Length + sizeof(UNICODE_NULL);
         RtlInitEmptyUnicodeString(&PathString,
                                   RtlAllocateHeap(SmpHeap, SmBaseTag, Length),
-                                  Length);
+                                  (USHORT)Length);
         if (!PathString.Buffer)
         {
             /* Fail if we have no memory for this */