diff --git a/glm/core/type_vec1.hpp b/glm/core/type_vec1.hpp
index 5dcbca88f..ffd8da1cb 100644
--- a/glm/core/type_vec1.hpp
+++ b/glm/core/type_vec1.hpp
@@ -41,6 +41,7 @@ namespace glm
 
 			typedef T value_type;
 			typedef std::size_t size_type;
+			GLM_FUNC_DECL size_type length() const;
 			static GLM_FUNC_DECL size_type value_size();
 
 			typedef tvec1<T> type;
diff --git a/glm/core/type_vec1.inl b/glm/core/type_vec1.inl
index 5fba5b806..df0d1ada9 100644
--- a/glm/core/type_vec1.inl
+++ b/glm/core/type_vec1.inl
@@ -11,6 +11,12 @@ namespace glm
 {
 	namespace detail
 	{
+		template <typename T>
+		GLM_FUNC_QUALIFIER typename tvec1<T>::size_type tvec1<T>::length() const
+		{
+			return 1;
+		}
+
 		template <typename T>
 		GLM_FUNC_QUALIFIER typename tvec1<T>::size_type tvec1<T>::value_size()
 		{
diff --git a/glm/core/type_vec2.hpp b/glm/core/type_vec2.hpp
index 47e384def..29d641ce8 100644
--- a/glm/core/type_vec2.hpp
+++ b/glm/core/type_vec2.hpp
@@ -41,6 +41,7 @@ namespace glm
 
 			typedef T value_type;
 			typedef std::size_t size_type;
+			GLM_FUNC_DECL size_type length() const;
 			static GLM_FUNC_DECL size_type value_size();
 
 			typedef tvec2<T> type;
diff --git a/glm/core/type_vec2.inl b/glm/core/type_vec2.inl
index 03e038b9c..b9fc67cba 100644
--- a/glm/core/type_vec2.inl
+++ b/glm/core/type_vec2.inl
@@ -11,6 +11,12 @@ namespace glm
 {
 	namespace detail
 	{
+		template <typename T>
+		GLM_FUNC_QUALIFIER typename tvec2<T>::size_type tvec2<T>::length() const
+		{
+			return 2;
+		}
+
 		template <typename T>
 		GLM_FUNC_QUALIFIER typename tvec2<T>::size_type tvec2<T>::value_size()
 		{
diff --git a/glm/core/type_vec3.hpp b/glm/core/type_vec3.hpp
index 7ea1cbfa8..1e06a7837 100644
--- a/glm/core/type_vec3.hpp
+++ b/glm/core/type_vec3.hpp
@@ -40,6 +40,7 @@ namespace glm
 
 			typedef T value_type;
 			typedef std::size_t size_type;
+			GLM_FUNC_DECL size_type length() const;
 			static GLM_FUNC_DECL size_type value_size();
 
 			typedef tvec3<T> type;
diff --git a/glm/core/type_vec3.inl b/glm/core/type_vec3.inl
index d9795d6cb..f7e9bfb50 100644
--- a/glm/core/type_vec3.inl
+++ b/glm/core/type_vec3.inl
@@ -11,6 +11,12 @@ namespace glm
 {
 	namespace detail
 	{
+		template <typename T>
+		GLM_FUNC_QUALIFIER typename tvec3<T>::size_type tvec3<T>::length() const
+		{
+			return 3;
+		}
+
 		template <typename T>
 		GLM_FUNC_QUALIFIER typename tvec3<T>::size_type tvec3<T>::value_size()
 		{
diff --git a/glm/core/type_vec4.hpp b/glm/core/type_vec4.hpp
index 25135de43..354cd5b77 100644
--- a/glm/core/type_vec4.hpp
+++ b/glm/core/type_vec4.hpp
@@ -40,6 +40,7 @@ namespace glm
 
 			typedef T value_type;
 			typedef std::size_t size_type;
+			GLM_FUNC_DECL size_type length() const;
 			static GLM_FUNC_DECL size_type value_size();
 
 			typedef tvec4<T> type;
diff --git a/glm/core/type_vec4.inl b/glm/core/type_vec4.inl
index e4c28f16e..52e16d8a4 100644
--- a/glm/core/type_vec4.inl
+++ b/glm/core/type_vec4.inl
@@ -11,6 +11,12 @@ namespace glm
 {
 	namespace detail
 	{
+		template <typename T>
+		GLM_FUNC_QUALIFIER typename tvec4<T>::size_type tvec4<T>::length() const
+		{
+			return 4;
+		}
+
 		template <typename T>
 		GLM_FUNC_QUALIFIER typename tvec4<T>::size_type tvec4<T>::value_size()
 		{