diff --git a/libs/core/helpers.ts b/libs/core/helpers.ts
index 8e06cca7..8c18311b 100644
--- a/libs/core/helpers.ts
+++ b/libs/core/helpers.ts
@@ -12,6 +12,7 @@ namespace Math {
     //% blockId=logic_random block="pick random true or false"
     //% help=math/random-boolean weight=0
     export function randomBoolean(): boolean {
-        return Math.floor(Math.randomRange(0, 1) * 2) == 1;
+        const v = Math.randomRange(0, 1) * 2;
+        return 1 == Math.floor(v);
     }
 }
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