diff --git a/backends/arm/_passes/fuse_batchnorm2d_pass.py b/backends/arm/_passes/fuse_batchnorm2d_pass.py
index 6a5ece2e446..26d4044054e 100644
--- a/backends/arm/_passes/fuse_batchnorm2d_pass.py
+++ b/backends/arm/_passes/fuse_batchnorm2d_pass.py
@@ -112,6 +112,7 @@ def try_set_param(
             if not try_set_param(conv_bias_node, fused_conv_bias) and try_set_param(
                 bn_bias_node, fused_conv_bias
             ):
+                # pyre-ignore[60]
                 # Conv didn't have bias but batchnorm did, steal bias from batchnorm.
                 conv_args = (*conv.args[0:2], bn_bias_node, *conv.args[3:])
                 conv.args = conv_args