diff --git a/reactos/drivers/wdm/audio/drivers/CMIDriver/cmicontrol/main.h b/reactos/drivers/wdm/audio/drivers/CMIDriver/cmicontrol/main.h
index edc2576cb45..b0edfabf94a 100644
--- a/reactos/drivers/wdm/audio/drivers/CMIDriver/cmicontrol/main.h
+++ b/reactos/drivers/wdm/audio/drivers/CMIDriver/cmicontrol/main.h
@@ -29,6 +29,7 @@ THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <math.h>
 
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <devioctl.h>
 #include <commctrl.h>
@@ -37,9 +38,10 @@ THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include <cpl.h>
 
 #include <ks.h>
+#include <mmreg.h>
 #include <ksmedia.h>
 #include <mmsystem.h>
-#include <mmreg.h>
+
 
 #define INITGUID
 #define DIRECTSOUND_VERSION 0x800
diff --git a/reactos/drivers/wdm/audio/drivers/CMIDriver/cpl/cmicpl.cpp b/reactos/drivers/wdm/audio/drivers/CMIDriver/cpl/cmicpl.cpp
index a81a3a773c2..bab8b1b67dc 100644
--- a/reactos/drivers/wdm/audio/drivers/CMIDriver/cpl/cmicpl.cpp
+++ b/reactos/drivers/wdm/audio/drivers/CMIDriver/cpl/cmicpl.cpp
@@ -25,6 +25,7 @@ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <shellapi.h>
 #include <tchar.h>