diff --git a/src/Context.cpp b/src/Context.cpp
index 0a9f5e6b9..a2d290dee 100644
--- a/src/Context.cpp
+++ b/src/Context.cpp
@@ -199,6 +199,7 @@ const std::vector<Extension>& Extension::extensions(Version version) {
     #else
     static const std::vector<Extension> extensions{
         _extension(GL,APPLE,texture_format_BGRA8888),
+        _extension(GL,CHROMIUM,map_sub),
         _extension(GL,EXT,texture_filter_anisotropic),
         _extension(GL,EXT,texture_format_BGRA8888),
         _extension(GL,EXT,read_format_bgra),
diff --git a/src/Extensions.h b/src/Extensions.h
index f1582d657..249dad0db 100644
--- a/src/Extensions.h
+++ b/src/Extensions.h
@@ -193,6 +193,8 @@ namespace GL {
         _extension(GL,APPLE,texture_format_BGRA8888, GLES200,   None) // #79
     } namespace ARM {
         _extension(GL,ARM,rgba8,                    GLES200, GLES300) // #82
+    } namespace CHROMIUM {
+        _extension(GL,CHROMIUM,map_sub,             GLES200,    None)
     } namespace EXT {
         _extension(GL,EXT,texture_filter_anisotropic, GLES200,  None) // #41
         _extension(GL,EXT,texture_type_2_10_10_10_REV, GLES200, GLES300) // #42