diff --git a/d2go/modeling/backbone/fbnet_cfg.py b/d2go/modeling/backbone/fbnet_cfg.py
index dfc22162..38be0afc 100644
--- a/d2go/modeling/backbone/fbnet_cfg.py
+++ b/d2go/modeling/backbone/fbnet_cfg.py
@@ -66,6 +66,9 @@ def add_fbnet_v2_default_configs(_C):
     # https://github.com/rbgirshick/yacs/blob/master/yacs/config.py#L410
     _C.MODEL.FBNET_V2.NORM_ARGS = []
 
+    # Set up operators fusion option in the backbone's blocks
+    _C.MODEL.FBNET_V2.FUSE_OPS = False
+
     _C.MODEL.VT_FPN = CN()
 
     _C.MODEL.VT_FPN.IN_FEATURES = ["res2", "res3", "res4", "res5"]
diff --git a/d2go/modeling/backbone/fbnet_v2.py b/d2go/modeling/backbone/fbnet_v2.py
index fcfb50b9..078e88a4 100644
--- a/d2go/modeling/backbone/fbnet_v2.py
+++ b/d2go/modeling/backbone/fbnet_v2.py
@@ -197,12 +197,16 @@ def build_fbnet(cfg, name, in_channels):
     stages = []
     trunk_stride_per_stage = _get_stride_per_stage(arch_def_blocks)
     shape_spec_per_stage = []
+    fuse_ops = getattr(cfg.MODEL.FBNET_V2, "FUSE_OPS", False)
+    is_qat = getattr(cfg, "QAT", False)
     for i, stride_i in enumerate(trunk_stride_per_stage):
         stages.append(
             builder.build_blocks(
                 arch_def_blocks,
                 stage_indices=[i],
                 prefix_name=FBNET_BUILDER_IDENTIFIER + "_",
+                fuse_ops=fuse_ops,
+                is_qat=is_qat,
             )
         )
         shape_spec_per_stage.append(