diff --git a/src/RS232.h b/src/RS232.h
--- a/src/RS232.h
+++ b/src/RS232.h
@@ -1,7 +1,7 @@
 // SOPSUYSI_RS232.h
 #ifndef RS232_H 
 #define RS232_H
-#define debug
+#define RS232_debug
 
 #define badPortValue -1
 #define rs232noerr 0
diff --git a/src/RS232_unix.c b/src/RS232_unix.c
--- a/src/RS232_unix.c
+++ b/src/RS232_unix.c
@@ -30,7 +30,7 @@ rs232port_t rs232open(char* psPortName)
    fd = (rs232port_t)open(psPortName, O_RDWR | O_NOCTTY );//| O_NDELAY);
    //fcntl((int)fd, F_SETFL, FNDELAY);
    //fd = open(psPortName, O_RDWR | O_NOCTTY);
-   #ifdef debug
+   #ifdef RS232_debug
       if(fd==-1)printf("can't open Port\n");
    #else
       if(fd!=-1)
@@ -149,7 +149,7 @@ int rs232setup(rs232port_t fd, int ChSiz
 		terminos.c_cc[VMIN]=0;
         	terminos.c_cc[VTIME]=1;
         	tcflush(fd, TCIFLUSH);
-		#ifdef debug
+		#ifdef RS232_debug
 			if(tcsetattr(fd, TCSANOW, &terminos)!=0)printf("bad setup\n");
 		#else
 			tcsetattr(fd, TCSANOW, &terminos);
diff --git a/src/RS232_win.c b/src/RS232_win.c
--- a/src/RS232_win.c
+++ b/src/RS232_win.c
@@ -101,7 +101,7 @@ rs232port_t rs232open(char* psPortName)
 {
         rs232port_t fd;
         fd = (rs232port_t)CreateFile(psPortName,GENERIC_READ | GENERIC_WRITE,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
-        #ifdef debug
+        #ifdef RS232_debug
 		if(fd==(rs232port_t)INVALID_HANDLE_VALUE)
 		{
 			printf("can't open Port\n");