diff --git a/src/util.cc b/src/util.cc
index b820aabb3a..544b547b29 100644
--- a/src/util.cc
+++ b/src/util.cc
@@ -1501,7 +1501,7 @@ TEST_CASE("util tokenize_string")
 	CHECK(v2.size() == 1);
 	}
 
-vector<string>* tokenize_string(const string &input, const string& delim,
+vector<string>* tokenize_string(const std::string_view input, const std::string_view delim,
                                 vector<string>* rval, int limit)
 	{
 	if ( ! rval )
diff --git a/src/util.h b/src/util.h
index 40c45b274e..9442357e0b 100644
--- a/src/util.h
+++ b/src/util.h
@@ -25,6 +25,7 @@
 #include <cstdint>
 
 #include <string>
+#include <string_view>
 #include <array>
 #include <vector>
 #include <stdio.h>
@@ -145,8 +146,8 @@ inline std::string get_escaped_string(const std::string& str, bool escape_all)
 	return get_escaped_string(str.data(), str.length(), escape_all);
 	}
 
-std::vector<std::string>* tokenize_string(const std::string &input,
-					  const std::string& delim,
+std::vector<std::string>* tokenize_string(std::string_view input,
+					  std::string_view delim,
 					  std::vector<std::string>* rval = 0, int limit = 0);
 
 extern char* copy_string(const char* s);