diff --git a/include/index_build_params.h b/include/index_build_params.h
index d4f454830..9f68eed84 100644
--- a/include/index_build_params.h
+++ b/include/index_build_params.h
@@ -2,6 +2,7 @@
 
 #include "common_includes.h"
 #include "parameters.h"
+#include "ann_exception.h"
 
 namespace diskann
 {