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-rw-r--r--src/noise.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/noise.cpp b/src/noise.cpp
index f67771b88..e6ca8a495 100644
--- a/src/noise.cpp
+++ b/src/noise.cpp
@@ -130,7 +130,9 @@ s32 PcgRandom::range(s32 min, s32 max)
if (max < min)
throw PrngException("Invalid range (max < min)");
- u32 bound = max - min + 1;
+ // We have to cast to s64 because otherwise this could overflow,
+ // and signed overflow is undefined behavior.
+ u32 bound = (s64)max - (s64)min + 1;
return range(bound) + min;
}