diff --git a/src/lib/ecl/validation/data_validator.h b/src/lib/ecl/validation/data_validator.h
index 26d55af11e..de87a49f63 100644
--- a/src/lib/ecl/validation/data_validator.h
+++ b/src/lib/ecl/validation/data_validator.h
@@ -41,6 +41,8 @@
 
 #pragma once
 
+#include <cmath>
+
 class DataValidator {
 public:
 	DataValidator(DataValidator *prev_sibling = nullptr);