1 files changed, 1 insertions, 1 deletions
diff --git a/gmp-h.in b/gmp-h.in
index 7449dd743..bca04e5ad 100644
--- a/gmp-h.in
+++ b/gmp-h.in
@@ -2039,7 +2039,7 @@ mpn_sub_1 (mp_ptr dst, mp_srcptr src, mp_size_t size, mp_limb_t n)
 /**************** C++ routines ****************/
 
 #ifdef __cplusplus
-#include <iostream>
+#include <iosfwd>
 std::ostream& __GMP_DECLSPEC operator<< (std::ostream &o, mpz_srcptr z);
 std::ostream& __GMP_DECLSPEC operator<< (std::ostream &o, mpq_srcptr q);
 std::ostream& __GMP_DECLSPEC operator<< (std::ostream &o, mpf_srcptr f);