diff --git a/tests/gamma.c b/tests/gamma.c
index dd10784e..33db05e1 100644
--- a/tests/gamma.c
+++ b/tests/gamma.c
@@ -124,6 +124,7 @@ int main(int argc, char** argv)
         exit(EXIT_FAILURE);
     }
 
+    glfwSetGamma(gamma);
     printf("Gamma: %f\n", gamma);
 
     glfwSwapInterval(1);