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-rw-r--r--src/hash.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/hash.cpp b/src/hash.cpp
index 728b9bd3831b..6f30d5a60581 100644
--- a/src/hash.cpp
+++ b/src/hash.cpp
@@ -181,7 +181,8 @@ __next_prime(size_t n)
// Select first potential prime >= n
// Known a-priori n >= L
size_t k0 = n / L;
- size_t in = std::lower_bound(indices, indices + M, n - k0 * L) - indices;
+ size_t in = static_cast<size_t>(std::lower_bound(indices, indices + M, n - k0 * L)
+ - indices);
n = L * k0 + indices[in];
while (true)
{