diff --git a/src/gpu/glsl/GrGLSL.cpp b/src/gpu/glsl/GrGLSL.cpp
index bec4784..69f046c 100644
--- a/src/gpu/glsl/GrGLSL.cpp
+++ b/src/gpu/glsl/GrGLSL.cpp
@@ -18,6 +18,7 @@
         case k150_GrGLSLGeneration:
         case k330_GrGLSLGeneration:
         case k400_GrGLSLGeneration:
+        case k420_GrGLSLGeneration:
         case k310es_GrGLSLGeneration:
         case k320es_GrGLSLGeneration:
             return true;
diff --git a/src/gpu/glsl/GrGLSL.h b/src/gpu/glsl/GrGLSL.h
index e6559fd..93eee31 100644
--- a/src/gpu/glsl/GrGLSL.h
+++ b/src/gpu/glsl/GrGLSL.h
@@ -41,6 +41,10 @@
      */
     k400_GrGLSLGeneration,
     /**
+     * Desktop GLSL 4.20
+     */
+    k420_GrGLSLGeneration,
+    /**
      * ES GLSL 3.10 only TODO Make GLSLCap objects to make this more granular
      */
     k310es_GrGLSLGeneration,