diff --git a/source_files/almostequals/AlmostEquals.h b/source_files/almostequals/AlmostEquals.h
index 72922c8a0..d0ca7422f 100644
--- a/source_files/almostequals/AlmostEquals.h
+++ b/source_files/almostequals/AlmostEquals.h
@@ -37,6 +37,7 @@
 #pragma once
 
 #include <limits>
+#include <cfloat>
 
 // This template class serves as a compile-time function from size to
 // type.  It maps a size in bytes to a primitive type with that