diff --git a/src/sbbs3/dosxtrn/dosxtrn.c b/src/sbbs3/dosxtrn/dosxtrn.c
index 541d3a953eab47468c36dcc652cc4ac2f42bba02..bd5ddc3b1d97a7f00961b659a2ca5923b67572b4 100644
--- a/src/sbbs3/dosxtrn/dosxtrn.c
+++ b/src/sbbs3/dosxtrn/dosxtrn.c
@@ -46,6 +46,12 @@
 #define DOSXTRN_REVISION	26
 #define VDD_FILENAME	"sbbsexec.dll"
 
+#if 0
+#define DEBUG_INT_CALLS
+#define DEBUG_DOS_CALLS
+#define DEBUG_FOSSIL_CALLS
+#endif
+
 /****************************************************************************/
 /* Truncates white-space chars off end of 'str' and terminates at first tab */
 /****************************************************************************/