diff --git a/libnfc/drivers/pn532_uart.c b/libnfc/drivers/pn532_uart.c
index 981a7dc..334671e 100644
--- a/libnfc/drivers/pn532_uart.c
+++ b/libnfc/drivers/pn532_uart.c
@@ -54,8 +54,15 @@
     // 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
-    // *BSD, Linux and others POSIX systems
+    // 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