diff --git a/common/broxton/hw-gfx-gma-plls.ads b/common/broxton/hw-gfx-gma-plls.ads
index d79d378..af957fb 100644
--- a/common/broxton/hw-gfx-gma-plls.ads
+++ b/common/broxton/hw-gfx-gma-plls.ads
@@ -24,7 +24,7 @@
    type T is (Invalid_PLL, DPLL_A, DPLL_B, DPLL_C);
    Invalid : constant T := Invalid_PLL;
 
-   procedure Initialize is null
+   procedure Initialize
    with
       Global => (Output => State);