diff --git a/src/poly/math.h b/src/poly/math.h
index 2bd43619c..0fbbb0702 100644
--- a/src/poly/math.h
+++ b/src/poly/math.h
@@ -36,7 +36,7 @@ T align(T value, T alignment) {
 // Rounds the given number up to the next highest multiple.
 template <typename T, typename V>
 T round_up(T value, V multiple) {
-  return value + multiple - 1 - (value - 1) % multiple;
+  return value ? (value + multiple - 1 - (value - 1) % multiple) : multiple;
 }
 
 inline float saturate(float value) {