diff --git a/reactos/drivers/bus/acpi/acpica/include/actypes.h b/reactos/drivers/bus/acpi/acpica/include/actypes.h
index a02cd108d01..2218921fb87 100644
--- a/reactos/drivers/bus/acpi/acpica/include/actypes.h
+++ b/reactos/drivers/bus/acpi/acpica/include/actypes.h
@@ -196,11 +196,11 @@
  *
  ******************************************************************************/
 
-typedef unsigned char                   BOOLEAN;
-typedef unsigned char                   UINT8;
-typedef unsigned short                  UINT16;
-typedef COMPILER_DEPENDENT_UINT64       UINT64;
-typedef COMPILER_DEPENDENT_INT64        INT64;
+// typedef unsigned char                   BOOLEAN;
+// typedef unsigned char                   UINT8;
+// typedef unsigned short                  UINT16;
+// typedef COMPILER_DEPENDENT_UINT64       UINT64;
+// typedef COMPILER_DEPENDENT_INT64        INT64;
 
 /*! [End] no source code translation !*/
 
@@ -225,8 +225,8 @@ typedef COMPILER_DEPENDENT_INT64        INT64;
 
 /*! [Begin] no source code translation (keep the typedefs as-is) */
 
-typedef unsigned int                    UINT32;
-typedef int                             INT32;
+// typedef unsigned int                    UINT32;
+// typedef int                             INT32;
 
 /*! [End] no source code translation !*/
 
@@ -264,8 +264,8 @@ typedef UINT64                          ACPI_PHYSICAL_ADDRESS;
 
 /*! [Begin] no source code translation (keep the typedefs as-is) */
 
-typedef unsigned int                    UINT32;
-typedef int                             INT32;
+// typedef unsigned int                    UINT32;
+// typedef int                             INT32;
 
 /*! [End] no source code translation !*/