diff --git a/reactos/drivers/usb/nt4compat/usbdriver/ehci.c b/reactos/drivers/usb/nt4compat/usbdriver/ehci.c
index 59ada70aa7a..8d3727e82a7 100644
--- a/reactos/drivers/usb/nt4compat/usbdriver/ehci.c
+++ b/reactos/drivers/usb/nt4compat/usbdriver/ehci.c
@@ -6059,7 +6059,10 @@ ehci_isr(PKINTERRUPT interrupt, PVOID context)
 {
 
     PEHCI_DEV ehci;
-    ULONG status, urb_count;
+    ULONG status;
+#ifdef DBG
+    ULONG urb_count;
+#endif
     PLIST_ENTRY pthis, pnext;
     PURB purb;
     BOOLEAN door_bell_rings;
diff --git a/reactos/drivers/usb/nt4compat/usbdriver/uhci.c b/reactos/drivers/usb/nt4compat/usbdriver/uhci.c
index 99c301df4a2..dbbd60db255 100644
--- a/reactos/drivers/usb/nt4compat/usbdriver/uhci.c
+++ b/reactos/drivers/usb/nt4compat/usbdriver/uhci.c
@@ -3771,9 +3771,9 @@ generic_start_io(IN PDEVICE_OBJECT dev_obj, IN PIRP irp)
 NTSTATUS
 DriverEntry(IN PDRIVER_OBJECT DriverObject, IN PUNICODE_STRING RegistryPath)
 {
+#if DBG
     NTSTATUS ntStatus = STATUS_SUCCESS;
 
-#if DBG
     // should be done before any debug output is done.
     // read our debug verbosity level from the registry
     //NetacOD_GetRegistryDword( NetacOD_REGISTRY_PARAMETERS_PATH, //absolute registry path
diff --git a/reactos/ntoskrnl/include/internal/i386/asmmacro.S b/reactos/ntoskrnl/include/internal/i386/asmmacro.S
index 9f1a25ba560..e9d3579577b 100644
--- a/reactos/ntoskrnl/include/internal/i386/asmmacro.S
+++ b/reactos/ntoskrnl/include/internal/i386/asmmacro.S
@@ -566,7 +566,9 @@ _KiUnexpectedInterrupt&Number:
     jnz 6f
 
     /* Assert the trap frame */
+#endif
 5:
+#ifdef DBG
     sub dword ptr [esp+KTRAP_FRAME_DEBUGARGMARK], 0xBADB0D00
     //jnz 0f // FIXME: ROS IS BROKEN