diff --git a/src/3rdparty/monocypher/monocypher.c b/src/3rdparty/monocypher/monocypher.c
index 5ad89e7b0e..4d5162e3fe 100644
--- a/src/3rdparty/monocypher/monocypher.c
+++ b/src/3rdparty/monocypher/monocypher.c
@@ -1685,7 +1685,7 @@ static int is_above_l(const u32 x[8])
         carry += (u64)x[i] + ~L[i];
         carry >>= 32;
     }
-    return carry;
+    return (int)carry;
 }
 
 // Final reduction modulo L, by conditionally removing L.