diff --git a/ortools/sat/swig_helper.h b/ortools/sat/swig_helper.h
index ddff136950..a4d5a27d85 100644
--- a/ortools/sat/swig_helper.h
+++ b/ortools/sat/swig_helper.h
@@ -16,6 +16,7 @@
 
 #include <atomic>
 
+#include "absl/strings/match.h"
 #include "ortools/base/file.h"
 #include "ortools/sat/cp_model.pb.h"
 #include "ortools/sat/cp_model_checker.h"