diff --git a/reactos/ntoskrnl/ke/clock.c b/reactos/ntoskrnl/ke/clock.c
index 14a5cdf18fa..3fea5e0c2f6 100644
--- a/reactos/ntoskrnl/ke/clock.c
+++ b/reactos/ntoskrnl/ke/clock.c
@@ -261,7 +261,7 @@ KeUpdateRunTime(IN PKTRAP_FRAME  TrapFrame,
     {
         /* Update user times */
         CurrentThread->UserTime++;
-        InterlockedIncrement(&CurrentProcess->UserTime);
+        InterlockedIncrement((PLONG)&CurrentProcess->UserTime);
         Prcb->UserTime++;
     }
     else
@@ -276,7 +276,7 @@ KeUpdateRunTime(IN PKTRAP_FRAME  TrapFrame,
         {
             /* This was normal kernel time */
             CurrentThread->KernelTime++;
-            InterlockedIncrement(&CurrentProcess->KernelTime);
+            InterlockedIncrement((PLONG)&CurrentProcess->KernelTime);
         }
         else if (Irql == DISPATCH_LEVEL)
         {
diff --git a/reactos/ntoskrnl/ob/obref.c b/reactos/ntoskrnl/ob/obref.c
index 99083b4859e..647ad280bf8 100644
--- a/reactos/ntoskrnl/ob/obref.c
+++ b/reactos/ntoskrnl/ob/obref.c
@@ -224,7 +224,7 @@ ObFastReplaceObject(IN PEX_FAST_REF FastRef,
     }
 
     /* Switch objects */
-    OldRef.Value = InterlockedExchange(&FastRef->Value, NewValue);
+    OldRef.Value = InterlockedExchange((PLONG)&FastRef->Value, NewValue);
     OldObject = (PVOID)((ULONG_PTR)OldRef.Object &~ MAX_FAST_REFS);
     if ((OldObject) && (OldRef.RefCnt))
     {
diff --git a/reactos/ntoskrnl/ob/obwait.c b/reactos/ntoskrnl/ob/obwait.c
index df03927f32a..7443928612f 100644
--- a/reactos/ntoskrnl/ob/obwait.c
+++ b/reactos/ntoskrnl/ob/obwait.c
@@ -477,6 +477,7 @@ NtSignalAndWaitForSingleObject(IN HANDLE ObjectHandleToSignal,
             !(HandleInfo.GrantedAccess & EVENT_MODIFY_STATE))
         {
             /* Fail: lack of rights */
+            Status = STATUS_ACCESS_DENIED;
             goto Quickie;
         }
 
@@ -505,6 +506,7 @@ NtSignalAndWaitForSingleObject(IN HANDLE ObjectHandleToSignal,
             !(HandleInfo.GrantedAccess & SEMAPHORE_MODIFY_STATE))
         {
             /* Fail: lack of rights */
+            Status = STATUS_ACCESS_DENIED;
             goto Quickie;
         }