diff --git a/glm/detail/type_vec3.hpp b/glm/detail/type_vec3.hpp
index 72d32286..808b6da4 100644
--- a/glm/detail/type_vec3.hpp
+++ b/glm/detail/type_vec3.hpp
@@ -161,6 +161,10 @@ namespace glm
 		template <typename U, precision Q>
 		GLM_FUNC_DECL GLM_EXPLICIT tvec3(tvec3<U, Q> const & v);
 
+		/// Other explicit conversions
+		template <typename U, precision Q>
+		GLM_FUNC_DECL GLM_EXPLICIT tvec3(tvec2<U, Q> const & v);
+
 		// -- Swizzle constructors --
 
 #		if GLM_HAS_ANONYMOUS_UNION && defined(GLM_SWIZZLE)
diff --git a/glm/detail/type_vec3.inl b/glm/detail/type_vec3.inl
index 38104a3a..92ff3aff 100644
--- a/glm/detail/type_vec3.inl
+++ b/glm/detail/type_vec3.inl
@@ -166,6 +166,14 @@ namespace glm
 		z(static_cast<T>(v.z))
 	{}
 
+	template <typename T, precision P>
+	template <typename U, precision Q>
+	GLM_FUNC_QUALIFIER tvec3<T, P>::tvec3(tvec2<U, Q> const & v) :
+		x(static_cast<T>(v.x)),
+		y(static_cast<T>(v.y)),
+		z(static_cast<T>(0))
+	{}
+
 	// -- Component accesses --
 
 #	ifdef GLM_FORCE_SIZE_FUNC
diff --git a/glm/detail/type_vec4.hpp b/glm/detail/type_vec4.hpp
index fe7235ac..396212a0 100644
--- a/glm/detail/type_vec4.hpp
+++ b/glm/detail/type_vec4.hpp
@@ -244,6 +244,13 @@ namespace detail
 		template <typename U, precision Q>
 		GLM_FUNC_DECL GLM_EXPLICIT tvec4(tvec4<U, Q> const & v);
 
+		/// Other explicit conversions
+		template <typename U, precision Q>
+		GLM_FUNC_DECL GLM_EXPLICIT tvec4(tvec2<U, Q> const & v);
+
+		template <typename U, precision Q>
+		GLM_FUNC_DECL GLM_EXPLICIT tvec4(tvec3<U, Q> const & v);
+
 		// -- Swizzle constructors --
 
 #		if GLM_HAS_ANONYMOUS_UNION && defined(GLM_SWIZZLE)
diff --git a/glm/detail/type_vec4.inl b/glm/detail/type_vec4.inl
index 6712ce33..0685dde2 100644
--- a/glm/detail/type_vec4.inl
+++ b/glm/detail/type_vec4.inl
@@ -268,6 +268,24 @@ namespace glm
 		w(static_cast<T>(v.w))
 	{}
 
+	template <typename T, precision P>
+	template <typename U, precision Q>
+	GLM_FUNC_QUALIFIER tvec4<T, P>::tvec4(tvec2<U, Q> const & v) :
+		x(static_cast<T>(v.x)),
+		y(static_cast<T>(v.y)),
+		z(static_cast<T>(0)),
+		w(static_cast<T>(0))
+	{}
+
+	template <typename T, precision P>
+	template <typename U, precision Q>
+	GLM_FUNC_QUALIFIER tvec4<T, P>::tvec4(tvec3<U, Q> const & v) :
+		x(static_cast<T>(v.x)),
+		y(static_cast<T>(v.y)),
+		z(static_cast<T>(v.z)),
+		w(static_cast<T>(0))
+	{}
+
 	// -- Component accesses --
 
 #	ifdef GLM_FORCE_SIZE_FUNC