diff --git a/Eigen/src/Core/util/Memory.h b/Eigen/src/Core/util/Memory.h
index 1a1d3e98d..4988be5d9 100644
--- a/Eigen/src/Core/util/Memory.h
+++ b/Eigen/src/Core/util/Memory.h
@@ -89,7 +89,7 @@ inline void throw_std_bad_alloc()
   #ifdef EIGEN_EXCEPTIONS
     throw std::bad_alloc();
   #else
-    std::size_t huge = -1ULL;
+    std::size_t huge = static_cast<std::size_t>(-1);
     new int[huge];
   #endif
 }