diff --git a/Eigen/src/Core/arch/CUDA/Half.h b/Eigen/src/Core/arch/CUDA/Half.h
index a63b20318..2cf49c97b 100644
--- a/Eigen/src/Core/arch/CUDA/Half.h
+++ b/Eigen/src/Core/arch/CUDA/Half.h
@@ -46,8 +46,8 @@
 
 // Make our own __half definition that is similar to CUDA's.
 struct __half {
-  __half() {}
-  explicit __half(unsigned short raw) : x(raw) {}
+  EIGEN_DEVICE_FUNC __half() {}
+  explicit EIGEN_DEVICE_FUNC __half(unsigned short raw) : x(raw) {}
   unsigned short x;
 };