diff --git a/src/dumm/ext/dumm.c b/src/dumm/ext/dumm.c
index ed667ccc0..230e8ae68 100644
--- a/src/dumm/ext/dumm.c
+++ b/src/dumm/ext/dumm.c
@@ -29,6 +29,7 @@
 #undef PACKAGE_VERSION
 #undef PACKAGE_STRING
 #undef PACKAGE_BUGREPORT
+#undef PACKAGE_URL
 #include <ruby.h>
 
 static dumm_t *dumm;
diff --git a/src/dumm/irdumm.c b/src/dumm/irdumm.c
index cf7f3423a..7543e6bd6 100644
--- a/src/dumm/irdumm.c
+++ b/src/dumm/irdumm.c
@@ -17,6 +17,8 @@
 #undef PACKAGE_TARNAME
 #undef PACKAGE_VERSION
 #undef PACKAGE_STRING
+#undef PACKAGE_BUGREPORT
+#undef PACKAGE_URL
 #include <ruby.h>
 
 /**