diff --git a/sprout/math/ilogb.hpp b/sprout/math/ilogb.hpp
index a09e23ae..033207c4 100644
--- a/sprout/math/ilogb.hpp
+++ b/sprout/math/ilogb.hpp
@@ -10,6 +10,7 @@
 
 #include <climits>
 #include <cfloat>
+#include <cmath>
 #include <type_traits>
 #include <sprout/config.hpp>
 #include <sprout/math/detail/config.hpp>
diff --git a/sprout/math/ilogb2.hpp b/sprout/math/ilogb2.hpp
index c3bf0e7f..480eef94 100644
--- a/sprout/math/ilogb2.hpp
+++ b/sprout/math/ilogb2.hpp
@@ -10,6 +10,7 @@
 
 #include <climits>
 #include <cfloat>
+#include <cmath>
 #include <type_traits>
 #include <sprout/config.hpp>
 #include <sprout/math/detail/config.hpp>