diff --git a/libNeonDomain/include/Neon/domain/tools/SpaceCurves.h b/libNeonDomain/include/Neon/domain/tools/SpaceCurves.h
index 835fa066..add3f51e 100644
--- a/libNeonDomain/include/Neon/domain/tools/SpaceCurves.h
+++ b/libNeonDomain/include/Neon/domain/tools/SpaceCurves.h
@@ -321,7 +321,7 @@ class Encoder
         -> uint64_t
     {
         uint64_t mortonEncoded = mortonEncode(dim, idx);
-        uint64_t bits = std::ceil(std::log2(dim.newType<uint64_t>().rMax()));
+        uint64_t bits = uint64_t(std::ceil(std::log2(dim.newType<uint64_t>().rMax())));
         return mortonToHilbert3D(mortonEncoded, bits);
     }