diff --git a/backend/mustek_usb2.h b/backend/mustek_usb2.h
index c9f0c86ab..ee8c4cb89 100644
--- a/backend/mustek_usb2.h
+++ b/backend/mustek_usb2.h
@@ -61,7 +61,7 @@
 #define DEF_LINEARTTHRESHOLD 128
 
 
-enum Mustek_Usb_Option
+enum
 {
   OPT_NUM_OPTS = 0,
   OPT_MODE_GROUP,
@@ -79,12 +79,13 @@ enum Mustek_Usb_Option
   OPT_TL_Y,			/* top-left y */
   OPT_BR_X,			/* bottom-right x */
   OPT_BR_Y,			/* bottom-right y */
+
   /* must come last: */
   NUM_OPTIONS
 };
 
 
-typedef struct Scanner_Model
+typedef struct
 {
   /** @name Identification */
   /*@{ */
@@ -126,7 +127,6 @@ typedef struct Mustek_Scanner
   SANE_Byte *Scan_data_buf;	/*store Scanned data for transfer */
   SANE_Byte *Scan_data_buf_start;	/*point to data need to transfer */
   size_t scan_buffer_len;	/* length of data buf */
-}
-Mustek_Scanner;
+} Mustek_Scanner;
 
 #endif
diff --git a/backend/mustek_usb2_asic.h b/backend/mustek_usb2_asic.h
index 8c2d2c91f..ee05e92eb 100644
--- a/backend/mustek_usb2_asic.h
+++ b/backend/mustek_usb2_asic.h
@@ -67,7 +67,7 @@
 #endif
 
 
-typedef enum tagFIRMWARESTATE
+typedef enum
 {
   FS_NULL = 0,
   FS_ATTACHED = 1,
@@ -75,13 +75,13 @@ typedef enum tagFIRMWARESTATE
   FS_SCANNING = 3
 } FIRMWARESTATE;
 
-typedef enum tagUSBHOST
+typedef enum
 {
   HT_USB10 = 0,
   HT_USB20 = 1
 } USBHOST;
 
-typedef enum tagLIGHTSOURCE
+typedef enum
 {
   LS_REFLECTIVE = 1,
   LS_POSITIVE = 2,
@@ -130,7 +130,7 @@ typedef struct
 } Timings;
 
 
-typedef struct tagADConverter
+typedef struct
 {
   SANE_Byte GainR;
   SANE_Byte GainG;
@@ -164,8 +164,7 @@ typedef struct
   SANE_Byte isMotorGoToFirstLine;	/*Roy add */
   SANE_Byte * lpShadingTable;	/*Roy add */
   SANE_Byte isUniformSpeedToScan;
-}
-Asic, *PAsic;
+} Asic, *PAsic;
 
 typedef enum
 {
@@ -176,8 +175,7 @@ typedef enum
   STATUS_INVAL,
   STATUS_MEM_ERROR,
   STATUS_IO_ERROR
-}
-STATUS;
+} STATUS;
 
 
 /* debug levels */
@@ -1150,7 +1148,7 @@ static STATUS Asic_SetCalibrate (PAsic chip, SANE_Byte bScanBits, unsigned short
 /* ---------------------- asic motor defines -------------------------- */
 
 
-typedef struct tagLLF_RAMACCESS
+typedef struct
 {
   SANE_Byte ReadWrite;
   SANE_Byte IsOnChipGamma;
@@ -1161,7 +1159,7 @@ typedef struct tagLLF_RAMACCESS
   SANE_Byte *BufferPtr;
 } LLF_RAMACCESS;
 
-typedef struct tagLLF_MOTOR_CURRENT_AND_PHASE
+typedef struct
 {
   SANE_Byte MoveType;
   SANE_Byte FillPhase;
@@ -1170,7 +1168,7 @@ typedef struct tagLLF_MOTOR_CURRENT_AND_PHASE
   SANE_Byte MotorCurrentTableB[32];
 } LLF_MOTOR_CURRENT_AND_PHASE;
 
-typedef struct tagLLF_CALCULATEMOTORTABLE
+typedef struct
 {
   unsigned short StartSpeed;
   unsigned short EndSpeed;
@@ -1179,13 +1177,13 @@ typedef struct tagLLF_CALCULATEMOTORTABLE
   unsigned short * lpMotorTable;
 } LLF_CALCULATEMOTORTABLE;
 
-typedef struct tagLLF_SETMOTORTABLE
+typedef struct
 {
   SANE_Byte MotorTableAddress;
   unsigned short *MotorTablePtr;
 } LLF_SETMOTORTABLE;
 
-typedef struct tagLLF_MOTORMOVE
+typedef struct
 {
   SANE_Byte ActionMode;		/* 0: AccDec Mode, 1: Uniform Speed Mode, 2: Test Mode */
   SANE_Byte ActionType;		/* 0: Forward, 1: Backward, 2:Back To Home */
diff --git a/backend/mustek_usb2_high.h b/backend/mustek_usb2_high.h
index 3381dcc14..11462a770 100644
--- a/backend/mustek_usb2_high.h
+++ b/backend/mustek_usb2_high.h
@@ -65,7 +65,7 @@ typedef unsigned char SCANTYPE;
 #define ST_Reflective	0x00
 #define ST_Transparent	0x01
 
-typedef enum tagCOLORMODE
+typedef enum
 {
   CM_RGB48 = 0,
   CM_RGB24 = 4,
@@ -80,7 +80,7 @@ typedef enum tagCOLORMODE
 
 /* structures use in parameters of export function*/
 
-typedef struct tagGETPARAMETERS
+typedef struct
 {
   unsigned short wSourceXDPI;
   unsigned short wSourceYDPI;
@@ -88,7 +88,7 @@ typedef struct tagGETPARAMETERS
   unsigned int dwLength;
 } GETPARAMETERS, *LPGETPARAMETERS;
 
-typedef struct tagFRAME
+typedef struct
 {
   unsigned short x1;
   unsigned short y1;
@@ -96,7 +96,7 @@ typedef struct tagFRAME
   unsigned short y2;
 } FRAME, *LPFRAME;
 
-typedef struct tagSETPARAMETERS
+typedef struct
 {
   FRAME fmArea;
   unsigned short wTargetDPI;
@@ -106,7 +106,7 @@ typedef struct tagSETPARAMETERS
   unsigned short * pGammaTable;
 } SETPARAMETERS, *LPSETPARAMETERS;
 
-typedef struct tagIMAGEROWS
+typedef struct
 {
   RGBORDER roRgbOrder;
   unsigned short wWantedLineNum;
@@ -114,7 +114,7 @@ typedef struct tagIMAGEROWS
   SANE_Byte * pBuffer;
 } IMAGEROWS, *LPIMAGEROWS;
 
-typedef struct tagTARGETIMAGE
+typedef struct
 {
   SANE_Bool isOptimalSpeed;
   COLORMODE cmColorMode;
@@ -126,7 +126,7 @@ typedef struct tagTARGETIMAGE
   SCANSOURCE ssScanSource;
 } TARGETIMAGE, *PTARGETIMAGE;
 
-typedef struct tagSUGGESTSETTING
+typedef struct
 {
   COLORMODE cmScanMode;
   unsigned short wXDpi;