diff --git a/xs.h b/xs.h
index 234a1d2..c44a8a0 100644
--- a/xs.h
+++ b/xs.h
@@ -38,7 +38,7 @@ typedef char d_char;
 #define _xs_blk_size(sz) ((((sz) + _XS_BLK_SIZE) / _XS_BLK_SIZE) * _XS_BLK_SIZE)
 
 void _xs_destroy(char **var);
-#define xs_debug() raise(5)
+#define xs_debug() raise(SIGTRAP)
 xstype xs_type(const char *data);
 int xs_size(const char *data);
 int xs_is_null(char *data);