diff --git a/GPU_version/vio/kernel/compute-residual.cl b/GPU_version/vio/kernel/compute-residual.cl
index 97b2394..10ebdc2 100644
--- a/GPU_version/vio/kernel/compute-residual.cl
+++ b/GPU_version/vio/kernel/compute-residual.cl
@@ -3,6 +3,7 @@
 
 // Enable OpenCL 32-bit integer atomic functions.
 #pragma OPENCL EXTENSION cl_khr_global_int32_base_atomics : enable
+#pragma OPENCL EXTENSION cl_khr_fp64 : enable
 
 float2 world2cam(float3 feature)
 {