diff --git a/detectron2/layers/csrc/deformable/deform_conv_cuda_kernel.cu b/detectron2/layers/csrc/deformable/deform_conv_cuda_kernel.cu
index f299c7add1..d4531443d6 100644
--- a/detectron2/layers/csrc/deformable/deform_conv_cuda_kernel.cu
+++ b/detectron2/layers/csrc/deformable/deform_conv_cuda_kernel.cu
@@ -73,7 +73,6 @@
 #include <float.h>
 #include <math.h>
 #include <stdio.h>
-#include <THC/THCAtomics.cuh>
 
 using namespace at;