diff --git a/src/libcamera/process.cpp b/src/libcamera/process.cpp
index 68fad327..fa92f58c 100644
--- a/src/libcamera/process.cpp
+++ b/src/libcamera/process.cpp
@@ -259,7 +259,21 @@ int Process::start(const std::string &path,
 		if (isolate())
 			_exit(EXIT_FAILURE);
 
-		closeAllFdsExcept(fds);
+		std::vector<int> v(fds);
+		v.push_back(STDERR_FILENO);
+		closeAllFdsExcept(v);
+
+		const auto tryDevNullLowestFd = [](int expected, int oflag) {
+			int fd = open("/dev/null", oflag);
+			if (fd < 0)
+				exit(EXIT_FAILURE);
+			if (fd != expected)
+				close(fd);
+		};
+
+		tryDevNullLowestFd(STDIN_FILENO, O_RDONLY);
+		tryDevNullLowestFd(STDOUT_FILENO, O_WRONLY);
+		tryDevNullLowestFd(STDERR_FILENO, O_WRONLY);
 
 		const char *file = utils::secure_getenv("LIBCAMERA_LOG_FILE");
 		if (file && strcmp(file, "syslog"))