diff --git a/src/add-ons/accelerants/radeon_hd/atombios/atombios.h b/src/add-ons/accelerants/radeon_hd/atombios/atombios.h
index 634780a38d..c9c11af80f 100644
--- a/src/add-ons/accelerants/radeon_hd/atombios/atombios.h
+++ b/src/add-ons/accelerants/radeon_hd/atombios/atombios.h
@@ -459,6 +459,7 @@ typedef struct _COMPUTE_MEMORY_ENGINE_PLL_PARAMETERS_V3
   union
   {
     ATOM_COMPUTE_CLOCK_FREQ  ulClock;         //Input Parameter
+    ULONG ulClockParams;                      //ULONG access for BE
     ATOM_S_MPLL_FB_DIVIDER   ulFbDiv;         //Output Parameter
   };
   UCHAR   ucRefDiv;                           //Output Parameter      
@@ -491,6 +492,7 @@ typedef struct _COMPUTE_MEMORY_ENGINE_PLL_PARAMETERS_V5
   union
   {
     ATOM_COMPUTE_CLOCK_FREQ  ulClock;         //Input Parameter
+    ULONG ulClockParams;                      //ULONG access for BE
     ATOM_S_MPLL_FB_DIVIDER   ulFbDiv;         //Output Parameter
   };
   UCHAR   ucRefDiv;                           //Output Parameter