diff --git a/internal/shaderir/program.go b/internal/shaderir/program.go
index 4ed745853..d53414332 100644
--- a/internal/shaderir/program.go
+++ b/internal/shaderir/program.go
@@ -140,6 +140,9 @@ const (
 	Vec2F            BuiltinFunc = "vec2"
 	Vec3F            BuiltinFunc = "vec3"
 	Vec4F            BuiltinFunc = "vec4"
+	Mat2F            BuiltinFunc = "mat2"
+	Mat3F            BuiltinFunc = "mat3"
+	Mat4F            BuiltinFunc = "mat4"
 	Radians          BuiltinFunc = "radians"
 	Degrees          BuiltinFunc = "degrees"
 	Sin              BuiltinFunc = "sin"