diff --git a/develop/singles/headers/meta.hpp/meta_all.hpp b/develop/singles/headers/meta.hpp/meta_all.hpp
index 5812898..ab1d096 100644
--- a/develop/singles/headers/meta.hpp/meta_all.hpp
+++ b/develop/singles/headers/meta.hpp/meta_all.hpp
@@ -449,7 +449,7 @@ namespace meta_hpp::detail
 
 namespace meta_hpp::detail
 {
-    enum class error_code {
+    enum class error_code : std::uint8_t {
         no_error,
 
         bad_cast,
@@ -1432,7 +1432,7 @@ namespace meta_hpp
 
 namespace meta_hpp::detail
 {
-    enum class type_kind : std::uint32_t {
+    enum class type_kind : std::uint8_t {
         array_,
         class_,
         constructor_,
@@ -2805,7 +2805,7 @@ namespace meta_hpp
             void* ptr;
         };
 
-        enum class storage_e : std::uintptr_t {
+        enum class storage_e : std::uint8_t {
             nothing,
             trivial,
             internal,
@@ -6408,7 +6408,7 @@ namespace meta_hpp::detail
 {
     class uarg_base {
     public:
-        enum class ref_types {
+        enum class ref_types : std::uint8_t {
             lvalue,
             const_lvalue,
             rvalue,
@@ -7447,7 +7447,7 @@ namespace meta_hpp::detail
 {
     class uinst_base {
     public:
-        enum class ref_types {
+        enum class ref_types : std::uint8_t {
             lvalue,
             const_lvalue,
             rvalue,
diff --git a/headers/meta.hpp/meta_base/exceptions.hpp b/headers/meta.hpp/meta_base/exceptions.hpp
index a126561..188d8c2 100644
--- a/headers/meta.hpp/meta_base/exceptions.hpp
+++ b/headers/meta.hpp/meta_base/exceptions.hpp
@@ -10,7 +10,7 @@
 
 namespace meta_hpp::detail
 {
-    enum class error_code {
+    enum class error_code : std::uint8_t {
         no_error,
 
         bad_cast,
diff --git a/headers/meta.hpp/meta_detail/type_kinds.hpp b/headers/meta.hpp/meta_detail/type_kinds.hpp
index 314a8ab..3161153 100644
--- a/headers/meta.hpp/meta_detail/type_kinds.hpp
+++ b/headers/meta.hpp/meta_detail/type_kinds.hpp
@@ -10,7 +10,7 @@
 
 namespace meta_hpp::detail
 {
-    enum class type_kind : std::uint32_t {
+    enum class type_kind : std::uint8_t {
         array_,
         class_,
         constructor_,
diff --git a/headers/meta.hpp/meta_detail/value_utilities/uarg.hpp b/headers/meta.hpp/meta_detail/value_utilities/uarg.hpp
index ea43076..67d075e 100644
--- a/headers/meta.hpp/meta_detail/value_utilities/uarg.hpp
+++ b/headers/meta.hpp/meta_detail/value_utilities/uarg.hpp
@@ -26,7 +26,7 @@ namespace meta_hpp::detail
 {
     class uarg_base {
     public:
-        enum class ref_types {
+        enum class ref_types : std::uint8_t {
             lvalue,
             const_lvalue,
             rvalue,
diff --git a/headers/meta.hpp/meta_detail/value_utilities/uinst.hpp b/headers/meta.hpp/meta_detail/value_utilities/uinst.hpp
index cd8584c..92d1998 100644
--- a/headers/meta.hpp/meta_detail/value_utilities/uinst.hpp
+++ b/headers/meta.hpp/meta_detail/value_utilities/uinst.hpp
@@ -17,7 +17,7 @@ namespace meta_hpp::detail
 {
     class uinst_base {
     public:
-        enum class ref_types {
+        enum class ref_types : std::uint8_t {
             lvalue,
             const_lvalue,
             rvalue,
diff --git a/headers/meta.hpp/meta_uvalue.hpp b/headers/meta.hpp/meta_uvalue.hpp
index 34e439c..6cbbb31 100644
--- a/headers/meta.hpp/meta_uvalue.hpp
+++ b/headers/meta.hpp/meta_uvalue.hpp
@@ -128,7 +128,7 @@ namespace meta_hpp
             void* ptr;
         };
 
-        enum class storage_e : std::uintptr_t {
+        enum class storage_e : std::uint8_t {
             nothing,
             trivial,
             internal,