diff --git a/similarity_search/src/distcomp_l2sqr_sift.cc b/similarity_search/src/distcomp_l2sqr_sift.cc
index dd5089e..38e7f6d 100644
--- a/similarity_search/src/distcomp_l2sqr_sift.cc
+++ b/similarity_search/src/distcomp_l2sqr_sift.cc
@@ -17,6 +17,7 @@
 #include "utils.h"
 #include "pow.h"
 #include "portable_intrinsics.h"
+#include "portable_simd.h"
 
 #include <cstdlib>
 #include <limits>