diff --git a/src/compiler/glsl/builtin_functions.cpp b/src/compiler/glsl/builtin_functions.cpp
index d7473ee4922..e262a1ec780 100644
--- a/src/compiler/glsl/builtin_functions.cpp
+++ b/src/compiler/glsl/builtin_functions.cpp
@@ -2132,6 +2132,8 @@ builtin_builder::create_builtins()
                 _textureSize(texture_multisample_array, glsl_type::ivec3_type, glsl_type::sampler2DMSArray_type),
                 _textureSize(texture_multisample_array, glsl_type::ivec3_type, glsl_type::isampler2DMSArray_type),
                 _textureSize(texture_multisample_array, glsl_type::ivec3_type, glsl_type::usampler2DMSArray_type),
+
+                _textureSize(texture_external_es3, glsl_type::ivec2_type, glsl_type::samplerExternalOES_type),
                 NULL);
 
    add_function("textureSize1D",