diff --git a/backend/mustek_usb2.c b/backend/mustek_usb2.c
index bc19c3d1e..22f478416 100644
--- a/backend/mustek_usb2.c
+++ b/backend/mustek_usb2.c
@@ -855,7 +855,6 @@ sane_read (SANE_Handle handle, SANE_Byte * buf, SANE_Int max_len,
 	    }
 
 	  DBG (DBG_DBG, "sane_read: Finish ReadScanedData\n");
-	  s->bIsReading = SANE_FALSE;
 	  s->scan_buf_len =
 	    image_row.wXferedLineNum * s->setpara.dwBytesPerRow;
 	  DBG (DBG_INFO, "sane_read : s->scan_buf_len = %ld\n",
@@ -872,6 +871,7 @@ sane_read (SANE_Handle handle, SANE_Byte * buf, SANE_Int max_len,
 	  free (tempbuf);
 	  s->scan_buf_start = s->scan_buf;
 	  s->read_rows -= image_row.wXferedLineNum;
+	  s->bIsReading = SANE_FALSE;
 	}
       else
 	{
diff --git a/backend/mustek_usb2_high.c b/backend/mustek_usb2_high.c
index c759fa3eb..f5a2a84a8 100644
--- a/backend/mustek_usb2_high.c
+++ b/backend/mustek_usb2_high.c
@@ -100,7 +100,7 @@ static pthread_t g_threadid_readimage;
 static COLORMODE g_ScanMode;
 static SCANSOURCE g_ssScanSource;
 
-ASIC g_chip;
+static ASIC g_chip;
 
 static int g_nSecLength, g_nDarkSecLength;
 static int g_nSecNum, g_nDarkSecNum;