diff --git a/os/log.c b/os/log.c
index e4e9e8b9d..9f95743b5 100644
--- a/os/log.c
+++ b/os/log.c
@@ -450,6 +450,13 @@ pnprintf(char *string, size_t size, const char *f, va_list args)
                     string[s_idx++] = number[i];
             }
             break;
+        case 'c':
+            {
+                char c = va_arg(args, int);
+                if (s_idx < size - 1)
+                    string[s_idx++] = c;
+            }
+            break;
         case '%':
             string[s_idx++] = '%';
             break;
diff --git a/test/signal-logging.c b/test/signal-logging.c
index 65baa456f..b45d8d4f3 100644
--- a/test/signal-logging.c
+++ b/test/signal-logging.c
@@ -201,6 +201,11 @@ static void logging_format(void)
     read_log_msg(logmsg);
     assert(strcmp(logmsg, "(EE) test %\n") == 0);
 
+    /* character */
+    LogMessageVerbSigSafe(X_ERROR, -1, "test %c\n", 'a');
+    read_log_msg(logmsg);
+    assert(strcmp(logmsg, "(EE) test a\n") == 0);
+
     /* string substitution */
     LogMessageVerbSigSafe(X_ERROR, -1, "%s\n", "substituted string");
     read_log_msg(logmsg);