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-rw-r--r--tests/hello_world_gles_deriv.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tests/hello_world_gles_deriv.c b/tests/hello_world_gles_deriv.c
index c5354d4e..592078ed 100644
--- a/tests/hello_world_gles_deriv.c
+++ b/tests/hello_world_gles_deriv.c
@@ -645,6 +645,7 @@ static const char vertex_shader[] =
static const char fragment_shader[] =
"#ifdef GL_ES\n"
+"#extension GL_OES_standard_derivatives : enable\n"
"precision mediump float;\n"
"#endif\n"
"varying vec4 Color;\n"