diff --git a/reactos/dll/directx/ddraw/startup.c b/reactos/dll/directx/ddraw/startup.c
index ef660ef1ef1..ce0bd06d921 100644
--- a/reactos/dll/directx/ddraw/startup.c
+++ b/reactos/dll/directx/ddraw/startup.c
@@ -136,7 +136,7 @@ Create_DirectDraw (LPGUID pGUID, LPDIRECTDRAW* pIface,
     {
         DX_STUB_str("Got iface\n");
 
-        if (StartDirectDraw((LPDIRECTDRAW)This, pGUID, FALSE) == DD_OK);
+        if (StartDirectDraw((LPDIRECTDRAW)This, pGUID, FALSE) == DD_OK)
         {
             /*
             RtlZeroMemory(&wnd_class, sizeof(wnd_class));
diff --git a/reactos/dll/win32/setupapi/driver.c b/reactos/dll/win32/setupapi/driver.c
index 6e214d1d8e0..3892bd5e2ca 100644
--- a/reactos/dll/win32/setupapi/driver.c
+++ b/reactos/dll/win32/setupapi/driver.c
@@ -1537,7 +1537,7 @@ SetupDiSetSelectedDriverA(
     if (DriverInfoData != NULL)
     {
         if (DriverInfoData->cbSize != sizeof(SP_DRVINFO_DATA_V2_A) &&
-            DriverInfoData->cbSize != sizeof(SP_DRVINFO_DATA_V1_A));
+            DriverInfoData->cbSize != sizeof(SP_DRVINFO_DATA_V1_A))
         {
             SetLastError(ERROR_INVALID_PARAMETER);
             return FALSE;
diff --git a/reactos/lib/rtl/message.c b/reactos/lib/rtl/message.c
index 8b74d3b2da0..9546cc124f5 100644
--- a/reactos/lib/rtl/message.c
+++ b/reactos/lib/rtl/message.c
@@ -110,7 +110,7 @@ RtlFindMessage(PVOID BaseAddress,
 	DPRINT("UnicodeText: %S\n", (PWSTR)MessageEntry->Text);
      }
 
-   if (MessageResourceEntry != NULL);
+   if (MessageResourceEntry != NULL)
      {
 	*MessageResourceEntry = MessageEntry;
      }
diff --git a/reactos/ntoskrnl/io/iomgr/controller.c b/reactos/ntoskrnl/io/iomgr/controller.c
index 6220ba8de43..5f738a593af 100644
--- a/reactos/ntoskrnl/io/iomgr/controller.c
+++ b/reactos/ntoskrnl/io/iomgr/controller.c
@@ -36,7 +36,7 @@ IoAllocateController(IN PCONTROLLER_OBJECT ControllerObject,
 
     /* Insert the Device Queue */
     if (!KeInsertDeviceQueue(&ControllerObject->DeviceWaitQueue,
-                             &DeviceObject->Queue.Wcb.WaitQueueEntry));
+                             &DeviceObject->Queue.Wcb.WaitQueueEntry))
     {
         /* Call the execution routine */
         Result = ExecutionRoutine(DeviceObject,
diff --git a/reactos/ntoskrnl/io/iomgr/remlock.c b/reactos/ntoskrnl/io/iomgr/remlock.c
index b5f301830dd..55eaff47d23 100644
--- a/reactos/ntoskrnl/io/iomgr/remlock.c
+++ b/reactos/ntoskrnl/io/iomgr/remlock.c
@@ -114,7 +114,7 @@ IoReleaseRemoveLockEx(IN PIO_REMOVE_LOCK RemoveLock,
     }
 
     /* Decrement the lock count */
-    if (!InterlockedDecrement(&Lock->Common.IoCount));
+    if (!InterlockedDecrement(&Lock->Common.IoCount))
     {
         /* Signal the event */
         KeSetEvent(&Lock->Common.RemoveEvent, IO_NO_INCREMENT, FALSE);