diff --git a/thrust/detail/complex/c99math.h b/thrust/detail/complex/c99math.h
index 754d02bea..d89769b68 100644
--- a/thrust/detail/complex/c99math.h
+++ b/thrust/detail/complex/c99math.h
@@ -16,6 +16,7 @@
  */
 #pragma once
 
+#include <math.h>
 #include <cmath>
 #include <thrust/detail/complex/math_private.h>