diff --git a/chip/pm4defs.pas b/chip/pm4defs.pas
index b6fa6305..176e8ff9 100644
--- a/chip/pm4defs.pas
+++ b/chip/pm4defs.pas
@@ -592,6 +592,11 @@ type
   REG_DATA:packed record end;
  end;
 
+ PPM4CMDDRAWINDEXBUFFERSIZE=^TPM4CMDDRAWINDEXBUFFERSIZE;
+ TPM4CMDDRAWINDEXBUFFERSIZE=packed record
+  numIndices:DWORD;
+ end;
+
  PPM4CMDDRAWINDEX2=^TPM4CMDDRAWINDEX2;
  TPM4CMDDRAWINDEX2=packed record
   maxSize      :DWORD;  // VGT_DMA_MAX_SIZE
diff --git a/chip/ps4_videodrv.pas b/chip/ps4_videodrv.pas
index 4bb09499..7f6332ad 100644
--- a/chip/ps4_videodrv.pas
+++ b/chip/ps4_videodrv.pas
@@ -1472,6 +1472,12 @@ begin
 
 end;
 
+procedure onIndexBufferSize(pm4Hdr:PM4_TYPE_3_HEADER;Body:PPM4CMDDRAWINDEXBUFFERSIZE);
+begin
+ GPU_REGS.VGT_DMA.SIZE    :=Body^.numIndices;
+ GPU_REGS.VGT_DMA.INDICES :=Body^.numIndices;
+end;
+
 type
  PVGT_DMA_INDEX_TYPE=^TVGT_DMA_INDEX_TYPE;
 
@@ -2563,6 +2569,12 @@ begin
          onSetUConfigReg(PM4_TYPE_3_HEADER(token),@PDWORD(P)[1]);
         end;
 
+        IT_INDEX_BUFFER_SIZE:
+        begin
+         {$ifdef ww}Writeln('IT_INDEX_BUFFER_SIZE');{$endif}
+         onIndexBufferSize(PM4_TYPE_3_HEADER(token),@PDWORD(P)[1]);
+        end;
+
         IT_INDEX_TYPE:
         begin
          {$ifdef ww}Writeln('IT_INDEX_TYPE');{$endif}