diff --git a/backends/cxxrtl/cxxrtl_backend.cc b/backends/cxxrtl/cxxrtl_backend.cc
index a56bfc036..1c22e7ae9 100644
--- a/backends/cxxrtl/cxxrtl_backend.cc
+++ b/backends/cxxrtl/cxxrtl_backend.cc
@@ -612,7 +612,7 @@ std::string escape_c_string(const std::string &input)
 	output.push_back('"');
 	for (auto c : input) {
 		if (::isprint(c)) {
-			if (c == '\\')
+			if (c == '\\' || c == '"')
 				output.push_back('\\');
 			output.push_back(c);
 		} else {
diff --git a/kernel/fmt.cc b/kernel/fmt.cc
index d1c6b8ac9..6ba1150ce 100644
--- a/kernel/fmt.cc
+++ b/kernel/fmt.cc
@@ -630,7 +630,7 @@ std::string escape_cxx_string(const std::string &input)
 	std::string output = "\"";
 	for (auto c : input) {
 		if (::isprint(c)) {
-			if (c == '\\')
+			if (c == '\\' || c == '"')
 				output.push_back('\\');
 			output.push_back(c);
 		} else {