diff -r bf3695fee719 -r 481802342fdf ucx/logging.c
--- a/ucx/logging.c	Mon Feb 04 14:11:57 2019 +0100
+++ b/ucx/logging.c	Mon Feb 04 17:17:48 2019 +0100
@@ -50,6 +50,8 @@
         ucx_map_int_put(logger->levels, l, (void*) "[WARNING]");
         l = UCX_LOGGER_INFO;
         ucx_map_int_put(logger->levels, l, (void*) "[INFO]");
+        l = UCX_LOGGER_DEBUG;
+        ucx_map_int_put(logger->levels, l, (void*) "[DEBUG]");
         l = UCX_LOGGER_TRACE;
         ucx_map_int_put(logger->levels, l, (void*) "[TRACE]");
     }
@@ -69,12 +71,15 @@
         const unsigned int line, const char *format, ...) {
     if (level <= logger->level) {
         char msg[UCX_LOGGER_MSGMAX];
-        char *text;
+        const char *text;
         size_t k = 0;
         size_t n;
         
         if ((logger->mask & UCX_LOGGER_LEVEL) > 0) {
-            text = (char*) ucx_map_int_get(logger->levels, level);
+            text = (const char*) ucx_map_int_get(logger->levels, level);
+            if (!text) {
+                text = "[UNKNOWN]";
+            }
             n = strlen(text);
             n = n > 256 ? 256 : n;
             memcpy(msg+k, text, n);
@@ -92,7 +97,9 @@
             k += sprintf(msg+k, ":%u ", line);
         }
         
-        msg[k++] = '-'; msg[k++] = ' ';
+        if (k > 0) {
+            msg[k++] = '-'; msg[k++] = ' ';
+        }
         
         va_list args;
         va_start (args, format);