1 files changed, 1 insertions, 0 deletions
diff --git a/xtr.cpp b/xtr.cpp
index 459f8ffe..9819b81d 100644
--- a/xtr.cpp
+++ b/xtr.cpp
@@ -5,6 +5,7 @@
 #include "xtr.h"
 #include "nbtheory.h"
 #include "integer.h"
+#include "algebra.h"
 #include "modarith.h"
 #include "algebra.cpp"