diff --git a/src/helpers.cpp b/src/helpers.cpp
index 4eaac6eb5..f8a7589a4 100644
--- a/src/helpers.cpp
+++ b/src/helpers.cpp
@@ -358,11 +358,13 @@ uint16_t Helpers::atoint(const char * value) {
 // rounds a number to 2 decimal places
 // example: round2(3.14159) -> 3.14
 double Helpers::round2(double value, const uint8_t divider) {
+    uint8_t div = (divider ? divider : 1); // prevent div-by-zero
+
     if (value >= 0) {
-        return (int)(value * 100 + 0.5) / 100.0;
-    } else {
-        return (int)(value * 100 - 0.5) / 100.0;
+        return (int)((value / div) * 100 + 0.5) / 100.0;
     }
+
+    return (int)((value / div) * 100 - 0.5) / 100.0; // negative values
 }
 
 // abs of a signed 32-bit integer