diff --git a/src/helpers.cpp b/src/helpers.cpp
index bb7d6f775..ec76c182b 100644
--- a/src/helpers.cpp
+++ b/src/helpers.cpp
@@ -255,6 +255,10 @@ char * Helpers::render_value(char * result, const double value, const int8_t for
     double v     = value < 0 ? value - 1.0 / (2 * p[format]) : value + 1.0 / (2 * p[format]);
     auto   whole = (int32_t)v;
 
+    if (whole == 0 && v < 0) {
+        result[0] = '-';
+        result++;
+    }
     itoa(whole, result, 10);
 
     while (*result != '\0') {