diff --git a/modules/gfx/src/shader/test_tex_fs.glsl b/modules/gfx/src/shader/test_tex_fs.glsl
index 575f75dfda4409b0267f9674d23fbcabc119e10b..bfa84270d2ebd3a5ca9b35740c01a8fce32c7ea5 100644
--- a/modules/gfx/src/shader/test_tex_fs.glsl
+++ b/modules/gfx/src/shader/test_tex_fs.glsl
@@ -1,6 +1,6 @@
 void main()
 {
-  gl_FragColor.rg=frac(gl_TexCoord[0].st);
+  gl_FragColor.rg=fract(gl_TexCoord[0].st);
   gl_FragColor.b=1.0;
   gl_FragColor.a=1.0;
 }