diff --git a/polymer/eduke32/Windows/src/backtrace.c b/polymer/eduke32/Windows/src/backtrace.c
index 3f9103bf9..b5cb64f75 100644
--- a/polymer/eduke32/Windows/src/backtrace.c
+++ b/polymer/eduke32/Windows/src/backtrace.c
@@ -22,6 +22,14 @@
 #include <windows.h>
 #include <excpt.h>
 #include <imagehlp.h>
+
+#ifndef PACKAGE
+# define PACKAGE EBACKTRACE1
+#endif
+#ifndef PACKAGE_VERSION
+# define PACKAGE_VERSION 1
+#endif
+
 #include <bfd.h>
 #include <psapi.h>
 #include <stdlib.h>