diff --git a/candle-kernels/src/unary.cu b/candle-kernels/src/unary.cu
index 726db339..bd8a210e 100644
--- a/candle-kernels/src/unary.cu
+++ b/candle-kernels/src/unary.cu
@@ -1,4 +1,6 @@
 #include "cuda_utils.cuh"
+#define _USE_MATH_DEFINES
+#include<math.h>
 #include<stdint.h>
 
 #define UNARY_OP(TYPENAME, FN_NAME, FUNC) \