diff --git a/configure b/configure
index 4faec5b..c4010ad 100755
--- a/configure
+++ b/configure
@@ -59,6 +59,9 @@ case $arg in
   --with-debug-kbd)
     cflags="$cflags -g -DWITH_DEBUG_KBD"
     ;;
+  --with-debug-rdp5)
+    cflags="$cflags -g -DWITH_DEBUG_RDP5"
+    ;;
   --without-debug*)
     ;;
   *)
diff --git a/rdesktop.h b/rdesktop.h
index 2c85996..f433af3 100644
--- a/rdesktop.h
+++ b/rdesktop.h
@@ -36,6 +36,12 @@
 #define DEBUG_KBD(args)
 #endif
 
+#ifdef WITH_DEBUG_RDP5
+#define DEBUG_RDP5(args) printf args;
+#else
+#define DEBUG_RDP5(args)
+#endif
+
 #define STRNCPY(dst,src,n) { strncpy(dst,src,n-1); dst[n-1] = 0; }
 
 #include "constants.h"