diff --git a/libnfc/buses/uart.h b/libnfc/buses/uart.h
index 87f9f27..8b0ea8a 100644
--- a/libnfc/buses/uart.h
+++ b/libnfc/buses/uart.h
@@ -43,8 +43,34 @@
   #include <sys/stat.h>
   #include <limits.h>
   #include <sys/time.h>
+
+  // unistd.h is needed for usleep() fct.
+  #include <unistd.h>
+  #define delay_ms( X ) usleep( X * 1000 )
 #else
   #include <windows.h>
+
+  #define snprintf _snprintf
+  #define strdup _strdup
+  #define delay_ms( X ) Sleep( X )
+#endif
+
+// Path to the serial port is OS-dependant.
+// Try to guess what we should use.
+//
+// XXX: Some review from users cross-compiling is welcome!
+#if defined(_WIN32)
+  #define SERIAL_STRING "COM"
+//#elif defined(__APPLE__)
+// TODO: find UART connection string for PN53X device on Mac OS X
+//  #define SERIAL_STRING ""
+#elif defined (__FreeBSD__) || defined (__OpenBSD__)
+  // XXX: Not tested
+  #define SERIAL_STRING "/dev/cuau"
+#elif defined (__linux__)
+  #define SERIAL_STRING "/dev/ttyUSB"
+#else
+  #error "Can't determine serial string for your system"
 #endif
 
 // Define shortcut to types to make code more readable
diff --git a/libnfc/drivers/arygon.c b/libnfc/drivers/arygon.c
index 8c43f21..0ff9090 100644
--- a/libnfc/drivers/arygon.c
+++ b/libnfc/drivers/arygon.c
@@ -41,25 +41,6 @@
 // Bus
 #include "uart.h"
 
-#ifdef _WIN32
-  #define SERIAL_STRING "COM"
-  #define snprintf _snprintf
-  #define strdup _strdup
-  #define delay_ms( X ) Sleep( X )
-#else
-  // unistd.h is needed for usleep() fct.
-  #include <unistd.h>
-  #define delay_ms( X ) usleep( X * 1000 )
-  
-  #ifdef __APPLE__
-    // MacOS
-    #define SERIAL_STRING "/dev/tty.SLAB_USBtoUART"
-  #else
-    // *BSD, Linux and others POSIX systems
-    #define SERIAL_STRING "/dev/ttyUSB"
-  #endif
-#endif
-
 #define BUFFER_LENGTH 256
 
 /** @def DEV_ARYGON_PROTOCOL_ARYGON_ASCII
diff --git a/libnfc/drivers/pn532_uart.c b/libnfc/drivers/pn532_uart.c
index 26c89a0..6359bcd 100644
--- a/libnfc/drivers/pn532_uart.c
+++ b/libnfc/drivers/pn532_uart.c
@@ -38,33 +38,6 @@
 // Bus
 #include "uart.h"
 
-#ifdef _WIN32
-  #define SERIAL_STRING "COM"
-  #define snprintf _snprintf
-  #define strdup _strdup
-  #define delay_ms( X ) Sleep( X )
-#else
-  // unistd.h is needed for usleep() fct.
-  #include <unistd.h>
-  #define delay_ms( X ) usleep( X * 1000 )
-  
-  #ifdef __APPLE__
-    // MacOS
-    // TODO: find UART connection string for PN53X device on Mac OS X
-    #define SERIAL_STRING ""
-  #elif defined(__FreeBSD__)
-    // XXX: Not tested
-    #define SERIAL_STRING "/dev/cuau"
-  #else
-    // Linux and maybe some operating systems
-    // FIXME: We'd rather have an #elif defined(__linux__) or something like
-    //        that and an #else that triggers an error at compile time instead
-    //        of "falling-back" on a value that is likely to not be suitable
-    //        for most operating systems.
-    #define SERIAL_STRING "/dev/ttyUSB"
-  #endif
-#endif
-
 #define BUFFER_LENGTH 256
 
 #define SERIAL_DEFAULT_PORT_SPEED 115200