diff --git a/kernel/yosys.cc b/kernel/yosys.cc
index ca1db3aa6..85de1ea72 100644
--- a/kernel/yosys.cc
+++ b/kernel/yosys.cc
@@ -295,35 +295,35 @@ void yosys_shutdown()
 #endif
 }
 
-RTLIL::IdString new_id(std::string file, int line, std::string func)
+RTLIL::IdString new_id(std::string_view file, int line, std::string_view func)
 {
 #ifdef _WIN32
 	size_t pos = file.find_last_of("/\\");
 #else
 	size_t pos = file.find_last_of('/');
 #endif
-	if (pos != std::string::npos)
+	if (pos != std::string_view::npos)
 		file = file.substr(pos+1);
 
 	pos = func.find_last_of(':');
-	if (pos != std::string::npos)
+	if (pos != std::string_view::npos)
 		func = func.substr(pos+1);
 
 	return stringf("$auto$%s:%d:%s$%d", file, line, func, autoidx++);
 }
 
-RTLIL::IdString new_id_suffix(std::string file, int line, std::string func, std::string suffix)
+RTLIL::IdString new_id_suffix(std::string_view file, int line, std::string_view func, std::string_view suffix)
 {
 #ifdef _WIN32
 	size_t pos = file.find_last_of("/\\");
 #else
 	size_t pos = file.find_last_of('/');
 #endif
-	if (pos != std::string::npos)
+	if (pos != std::string_view::npos)
 		file = file.substr(pos+1);
 
 	pos = func.find_last_of(':');
-	if (pos != std::string::npos)
+	if (pos != std::string_view::npos)
 		func = func.substr(pos+1);
 
 	return stringf("$auto$%s:%d:%s$%s$%d", file, line, func, suffix, autoidx++);
diff --git a/kernel/yosys_common.h b/kernel/yosys_common.h
index 4794b5618..08b7fdc08 100644
--- a/kernel/yosys_common.h
+++ b/kernel/yosys_common.h
@@ -271,8 +271,8 @@ extern int autoidx;
 extern int yosys_xtrace;
 extern bool yosys_write_versions;
 
-RTLIL::IdString new_id(std::string file, int line, std::string func);
-RTLIL::IdString new_id_suffix(std::string file, int line, std::string func, std::string suffix);
+RTLIL::IdString new_id(std::string_view file, int line, std::string_view func);
+RTLIL::IdString new_id_suffix(std::string_view file, int line, std::string_view func, std::string_view suffix);
 
 #define NEW_ID \
 	YOSYS_NAMESPACE_PREFIX new_id(__FILE__, __LINE__, __FUNCTION__)