diff --git a/src/xrt/auxiliary/util/u_logging.c b/src/xrt/auxiliary/util/u_logging.c
index 945e52396..5985d7031 100644
--- a/src/xrt/auxiliary/util/u_logging.c
+++ b/src/xrt/auxiliary/util/u_logging.c
@@ -132,6 +132,8 @@ u_log(const char *file, int line, const char *func, enum u_logging_level level,
 	printed += vsprintf_s(buf + printed, remainingBuffer - printed, format, args);
 	va_end(args);
 	*(buf + printed) = '\n';
+	printed++;
+	*(buf + printed) = '\0';
 	OutputDebugStringA(buf);
 }