diff --git a/gcc/system.h b/gcc/system.h
index c209871df72d..57ce22ab893c 100644
--- a/gcc/system.h
+++ b/gcc/system.h
@@ -222,6 +222,9 @@ extern int fprintf_unlocked (FILE *, const char *, ...);
 #ifdef INCLUDE_FUNCTIONAL
 # include <functional>
 #endif
+#ifdef INCLUDE_SSTREAM
+# include <sstream>
+#endif
 # include <memory>
 # include <cstring>
 # include <initializer_list>
@@ -764,10 +767,6 @@ private:
 # include <mutex>
 #endif
 
-#ifdef INCLUDE_SSTREAM
-# include <sstream>
-#endif
-
 #ifdef INCLUDE_MALLOC_H
 #if defined(HAVE_MALLINFO) || defined(HAVE_MALLINFO2)
 #include <malloc.h>