diff --git a/README.md b/README.md
index f510042..4ecb61e 100644
--- a/README.md
+++ b/README.md
@@ -239,6 +239,7 @@ you might use:
 
 #ifdef GHC_USE_STD_FS
     #include <filesystem>
+    #include <fstream>
     namespace fs {
         using namespace std::filesystem;
         using ifstream = std::ifstream;
@@ -318,6 +319,7 @@ switching like this:
 
 #ifdef GHC_USE_STD_FS
     #include <filesystem>
+    #include <fstream>
     namespace fs {
         using namespace std::filesystem;
         using ifstream = std::ifstream;
diff --git a/include/ghc/fs_std.hpp b/include/ghc/fs_std.hpp
index f09eeec..9eb38ac 100644
--- a/include/ghc/fs_std.hpp
+++ b/include/ghc/fs_std.hpp
@@ -58,6 +58,7 @@
 
 #ifdef GHC_USE_STD_FS
     #include <filesystem>
+    #include <fstream>
     namespace fs {
         using namespace std::filesystem;
         using ifstream = std::ifstream;
diff --git a/include/ghc/fs_std_fwd.hpp b/include/ghc/fs_std_fwd.hpp
index 372470f..3114d75 100644
--- a/include/ghc/fs_std_fwd.hpp
+++ b/include/ghc/fs_std_fwd.hpp
@@ -60,6 +60,7 @@
 
 #ifdef GHC_USE_STD_FS
     #include <filesystem>
+    #include <fstream>
     namespace fs {
         using namespace std::filesystem;
         using ifstream = std::ifstream;