diff --git a/tools/intel_gpu_dump.c b/tools/intel_gpu_dump.c
index 09cae3fe..1793fd79 100644
--- a/tools/intel_gpu_dump.c
+++ b/tools/intel_gpu_dump.c
@@ -1551,6 +1551,7 @@ decode_3d_965(uint32_t *data, int count, uint32_t hw_offset, int *failures)
 			(data[1] >> 4) & 0x1f, data[1] & 0x7);
 	return len;
     case 0x6002:
+	len = (data[0] & 0x000000ff) + 2;
 	instr_out(data, hw_offset, 0, "CONSTANT_BUFFER: %s\n",
 			(data[0] >> 8) & 1 ? "valid" : "invalid");
 	instr_out(data, hw_offset, 1, "offset: 0x%08x, length: 0x%08x\n",