diff --git a/include/dynarmic/A64/a64.h b/include/dynarmic/A64/a64.h
index 58276efc..52946b1d 100644
--- a/include/dynarmic/A64/a64.h
+++ b/include/dynarmic/A64/a64.h
@@ -75,7 +75,7 @@ public:
     void SetRegisters(const std::array<std::uint64_t, 31>& value);
 
     using Vector = std::array<std::uint64_t, 2>;
-    static_assert(sizeof(Vector) == sizeof(std::uint64_t) * 2);
+    static_assert(sizeof(Vector) == sizeof(std::uint64_t) * 2, "Vector must be 128 bits in size");
 
     /// Read floating point and SIMD register.
     Vector GetVector(std::size_t index) const;