diff --git a/libgnuworld/EConfig.h b/libgnuworld/EConfig.h
index fbc5e679..00cafe5b 100755
--- a/libgnuworld/EConfig.h
+++ b/libgnuworld/EConfig.h
@@ -29,6 +29,7 @@
 #include	<list>
 #include	<map>
 #include	<concepts>
+#include	<sstream>
 
 #include	"ELog.h"
 #include	"misc.h" // noCaseCompare
diff --git a/libgnuworld/logger.h b/libgnuworld/logger.h
index 8665c124..473aa67e 100644
--- a/libgnuworld/logger.h
+++ b/libgnuworld/logger.h
@@ -22,6 +22,7 @@
 
 #include <string>
 #include <fstream>
+#include <sstream>
 #include <functional>
 #include <typeindex>
 #ifdef HAVE_FORMAT