diff --git a/internal/ceres/visibility.cc b/internal/ceres/visibility.cc
index 9d80654..8e80fd1 100644
--- a/internal/ceres/visibility.cc
+++ b/internal/ceres/visibility.cc
@@ -28,6 +28,8 @@
 //
 // Author: kushalav@google.com (Avanish Kushal)
 
+#include "ceres/visibility.h"
+
 #include <cmath>
 #include <ctime>
 #include <algorithm>