diff --git a/src/include/units/ratio.h b/src/include/units/ratio.h
index ff98b0bf..9848b142 100644
--- a/src/include/units/ratio.h
+++ b/src/include/units/ratio.h
@@ -28,7 +28,6 @@
 #include <numeric>
 #include <type_traits>
 #include <tuple>
-#include <algorithm>
 #include <gsl/gsl_assert>
 
 namespace units {