diff --git a/ext_libs/string-view-lite/nonstd/string_view.hpp b/ext_libs/string-view-lite/nonstd/string_view.hpp
index 7e3d6a166cd..66fec50076a 100644
--- a/ext_libs/string-view-lite/nonstd/string_view.hpp
+++ b/ext_libs/string-view-lite/nonstd/string_view.hpp
@@ -128,6 +128,8 @@
 
 #if nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS
 
+#include <string>
+
 namespace nonstd {
 
 template< class CharT, class Traits, class Allocator = std::allocator<CharT> >