diff --git a/auto/bin/filter_gl_ext.sh b/auto/bin/filter_gl_ext.sh
index 4cd9f5f..87bb2c8 100755
--- a/auto/bin/filter_gl_ext.sh
+++ b/auto/bin/filter_gl_ext.sh
@@ -384,6 +384,12 @@ EOT
     void glTexturePageCommitmentEXT (GLuint texture, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLboolean commit)
 EOT
 
+# add missing functions to GL_EXT_direct_state_access (GL_EXT_buffer_storage related)
+# https://github.com/nigels-com/glew/issues/454
+    cat >> $1/GL_EXT_direct_state_access <<EOT
+    void glNamedBufferStorageEXT (GLuint buffer, GLsizeiptr size, const void *data, GLbitfield flags)
+EOT
+
 # Filter out GL_UNSIGNED_INT and GL_FLOAT from GL_AMD_performance_monitor
     grep -v 'GL_UNSIGNED_INT ' $1/GL_AMD_performance_monitor > tmp
     mv tmp $1/GL_AMD_performance_monitor
diff --git a/auto/core/gl/GL_EXT_buffer_storage b/auto/core/gl/GL_EXT_buffer_storage
deleted file mode 100644
index 5bee2c4..0000000
--- a/auto/core/gl/GL_EXT_buffer_storage
+++ /dev/null
@@ -1,15 +0,0 @@
-GL_EXT_buffer_storage
-https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_buffer_storage.txt
-GL_EXT_buffer_storage
-
-	GL_MAP_READ_BIT 0x0001
-	GL_MAP_WRITE_BIT 0x0002
-	GL_MAP_PERSISTENT_BIT_EXT 0x0040
-	GL_MAP_COHERENT_BIT_EXT 0x0080
-	GL_DYNAMIC_STORAGE_BIT_EXT 0x0100
-	GL_CLIENT_STORAGE_BIT_EXT 0x0200
-	GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT_EXT 0x00004000
-	GL_BUFFER_IMMUTABLE_STORAGE_EXT 0x821F
-	GL_BUFFER_STORAGE_FLAGS_EXT 0x8220
-	void glBufferStorageEXT (GLenum target, GLsizeiptr size, const void *data, GLbitfield flags)
-	void glNamedBufferStorageEXT (GLuint buffer, GLsizeiptr size, const void *data, GLbitfield flags)