diff --git a/src/constants.js b/src/constants.js
index b060ae6f6f89ec321f8d77ff1a3387cafe40d21e..4909684bcf05f2855bc7e57386725b0c14d44e22 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -92,15 +92,15 @@ export var LuminanceAlphaFormat = 1025;
 export var RGBEFormat = RGBAFormat;
 export var DepthFormat = 1026;
 export var DepthStencilFormat = 1027;
-export var RGB_S3TC_DXT1_Format = 2001;
-export var RGBA_S3TC_DXT1_Format = 2002;
-export var RGBA_S3TC_DXT3_Format = 2003;
-export var RGBA_S3TC_DXT5_Format = 2004;
-export var RGB_PVRTC_4BPPV1_Format = 2100;
-export var RGB_PVRTC_2BPPV1_Format = 2101;
-export var RGBA_PVRTC_4BPPV1_Format = 2102;
-export var RGBA_PVRTC_2BPPV1_Format = 2103;
-export var RGB_ETC1_Format = 2151;
+export var RGB_S3TC_DXT1_Format = 33776;
+export var RGBA_S3TC_DXT1_Format = 33777;
+export var RGBA_S3TC_DXT3_Format = 33778;
+export var RGBA_S3TC_DXT5_Format = 33779;
+export var RGB_PVRTC_4BPPV1_Format = 35840;
+export var RGB_PVRTC_2BPPV1_Format = 35841;
+export var RGBA_PVRTC_4BPPV1_Format = 35842;
+export var RGBA_PVRTC_2BPPV1_Format = 35843;
+export var RGB_ETC1_Format = 36196;
 export var RGBA_ASTC_4x4_Format = 37808;
 export var RGBA_ASTC_5x4_Format = 37809;
 export var RGBA_ASTC_5x5_Format = 37810;
diff --git a/src/renderers/webgl/WebGLState.js b/src/renderers/webgl/WebGLState.js
index a35895b0266905d1e0dec031b30bbb82d24085bb..6438f7da361a569009555f980e6025d3ff9a815e 100644
--- a/src/renderers/webgl/WebGLState.js
+++ b/src/renderers/webgl/WebGLState.js
@@ -491,7 +491,8 @@ function WebGLState( gl, extensions, utils ) {
 
 			if ( extensions.get( 'WEBGL_compressed_texture_pvrtc' ) ||
 			     extensions.get( 'WEBGL_compressed_texture_s3tc' ) ||
-			     extensions.get( 'WEBGL_compressed_texture_etc1' ) ) {
+			     extensions.get( 'WEBGL_compressed_texture_etc1' ) ||
+			     extensions.get( 'WEBGL_compressed_texture_astc' ) ) {
 
 				var formats = gl.getParameter( gl.COMPRESSED_TEXTURE_FORMATS );