diff --git src/io_ftdi.c src/io_ftdi.c
index 782b206..92bca2d 100644
--- src/io_ftdi.c
+++ src/io_ftdi.c
@@ -10,8 +10,6 @@
 #define PORT_TMS            0x08
 #define IO_OUTPUT (PORT_TCK|PORT_TDI|PORT_TMS)
 
-#define USE_ASYNC
-
 #ifndef USE_ASYNC
 #define FTDI_MAX_WRITESIZE 256
 #endif
@@ -77,7 +75,6 @@ int io_scan(const unsigned char *TMS, const unsigned char *TDI, unsigned char *T
 	unsigned char buffer[16384];
 	int i, res; 
 #ifndef USE_ASYNC
-#error no async
 	int r, t;
 #endif
 	
@@ -125,7 +122,7 @@ int io_scan(const unsigned char *TMS, const unsigned char *TDI, unsigned char *T
 			if (res < 0)
 			{
 				fprintf(stderr, "ftdi_read_data %d (%s)\n", res, ftdi_get_error_string(&ftdi));
-				return -1
+				return -1;
 			}
 			
 			i += res;