diff --git a/README.md b/README.md
index 7388400..1ada1f6 100644
--- a/README.md
+++ b/README.md
@@ -77,7 +77,7 @@ class vec_base<T, 2> {
 public:
     T x{}, y{};
 
-    vec_base() = default;
+    constexpr vec_base() = default;
     constexpr explicit vec_base(T v);
     constexpr vec_base(T x, T y);
     constexpr explicit vec_base(const vec_base<T, 3>& xy);
@@ -89,7 +89,7 @@ class vec_base<T, 3> {
 public:
     T x{}, y{}, z{};
 
-    vec_base() = default;
+    constexpr vec_base() = default;
     constexpr explicit vec_base(T v);
     constexpr vec_base(T x, T y, T z);
     constexpr vec_base(const vec_base<T, 2>& xy, T z);
@@ -102,7 +102,7 @@ class vec_base<T, 4> {
 public:
     T x{}, y{}, z{}, w{};
 
-    vec_base() = default;
+    constexpr vec_base() = default;
     constexpr explicit vec_base(T v);
     constexpr vec_base(T x, T y, T z, T w);
     constexpr vec_base(const vec_base<T, 2>& xy, T z, T w);
@@ -179,7 +179,7 @@ public:
         {1, 0},
         {0, 1}};
 
-    mat_base() = default;
+    constexpr mat_base() = default;
     constexpr explicit mat_base(T v);
 
     constexpr mat_base(
@@ -204,7 +204,7 @@ public:
         {0, 1, 0},
         {0, 0, 1}};
 
-    mat_base() = default;
+    constexpr mat_base() = default;
     constexpr explicit mat_base(T v);
 
     constexpr mat_base(
@@ -232,7 +232,7 @@ public:
         {0, 0, 1, 0},
         {0, 0, 0, 1}};
 
-    mat_base() = default;
+    constexpr mat_base() = default;
     constexpr explicit mat_base(T v);
 
     constexpr mat_base(
diff --git a/headers/vmath.hpp/vmath_mat.hpp b/headers/vmath.hpp/vmath_mat.hpp
index ecb7a32..e843f00 100644
--- a/headers/vmath.hpp/vmath_mat.hpp
+++ b/headers/vmath.hpp/vmath_mat.hpp
@@ -24,7 +24,7 @@ namespace vmath_hpp::detail
             {1, 0},
             {0, 1}};
     public:
-        mat_base() = default;
+        constexpr mat_base() = default;
 
         constexpr explicit mat_base(T v)
         : rows{
@@ -65,7 +65,7 @@ namespace vmath_hpp::detail
             {0, 1, 0},
             {0, 0, 1}};
     public:
-        mat_base() = default;
+        constexpr mat_base() = default;
 
         constexpr explicit mat_base(T v)
         : rows{
@@ -113,7 +113,7 @@ namespace vmath_hpp::detail
             {0, 0, 1, 0},
             {0, 0, 0, 1}};
     public:
-        mat_base() = default;
+        constexpr mat_base() = default;
 
         constexpr explicit mat_base(T v)
         : rows{
@@ -179,13 +179,9 @@ namespace vmath_hpp
         using base_type::mat_base;
         using base_type::rows;
 
-        mat() = default;
-
-        mat(mat&&) = default;
-        mat& operator=(mat&&) = default;
-
-        mat(const mat&) = default;
-        mat& operator=(const mat&) = default;
+        constexpr mat() = default;
+        constexpr mat(const mat&) = default;
+        constexpr mat& operator=(const mat&) = default;
 
         void swap(mat& other) noexcept(std::is_nothrow_swappable_v<T>) {
             for ( std::size_t i = 0; i < Size; ++i ) {
diff --git a/headers/vmath.hpp/vmath_vec.hpp b/headers/vmath.hpp/vmath_vec.hpp
index cd80289..3f37281 100644
--- a/headers/vmath.hpp/vmath_vec.hpp
+++ b/headers/vmath.hpp/vmath_vec.hpp
@@ -18,7 +18,7 @@ namespace vmath_hpp::detail
     public:
         T x{}, y{};
     public:
-        vec_base() = default;
+        constexpr vec_base() = default;
 
         constexpr explicit vec_base(T v)
         : x{v}, y{v} {}
@@ -54,7 +54,7 @@ namespace vmath_hpp::detail
     public:
         T x{}, y{}, z{};
     public:
-        vec_base() = default;
+        constexpr vec_base() = default;
 
         constexpr explicit vec_base(T v)
         : x{v}, y{v}, z{v} {}
@@ -95,7 +95,7 @@ namespace vmath_hpp::detail
     public:
         T x{}, y{}, z{}, w{};
     public:
-        vec_base() = default;
+        constexpr vec_base() = default;
 
         constexpr explicit vec_base(T v)
         : x{v}, y{v}, z{v}, w{v} {}
@@ -164,13 +164,9 @@ namespace vmath_hpp
         using base_type::vec_base;
         using base_type::operator[];
 
-        vec() = default;
-
-        vec(vec&&) = default;
-        vec& operator=(vec&&) = default;
-
-        vec(const vec&) = default;
-        vec& operator=(const vec&) = default;
+        constexpr vec() = default;
+        constexpr vec(const vec&) = default;
+        constexpr vec& operator=(const vec&) = default;
 
         void swap(vec& other) noexcept(std::is_nothrow_swappable_v<T>) {
             for ( std::size_t i = 0; i < Size; ++i ) {