diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index 9193234effc4..e3df360f7175 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,4 +1,8 @@
-2004-06-22  Tobias Schlueter  <tobias.schlueter@physik.uni-muenchen.de>
+2004-06-29  Tobias Schlueter  <tobias.schlueter@physik.uni-muenchen.de>
+
+	* module.c (mio_gmp_real): Correct writing of negative numbers.
+
+2004-06-29  Tobias Schlueter  <tobias.schlueter@physik.uni-muenchen.de>
 
 	PR fortran/15963
 	* expr.c (check_intrinsic_op): Allow comparison of characters.
diff --git a/gcc/fortran/module.c b/gcc/fortran/module.c
index eace654810a5..cf8f453400ad 100644
--- a/gcc/fortran/module.c
+++ b/gcc/fortran/module.c
@@ -2274,6 +2274,15 @@ mio_gmp_real (mpf_t * real)
       atom_string = gfc_getmem (strlen (p) + 20);
 
       sprintf (atom_string, "0.%s@%ld", p, exponent);
+
+      /* Fix negative numbers.  */
+      if (atom_string[2] == '-')
+	{
+	  atom_string[0] = '-';
+	  atom_string[1] = '0';
+	  atom_string[2] = '.';
+	}
+
       write_atom (ATOM_STRING, atom_string);
 
       gfc_free (atom_string);
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index ae3a5d2c1b00..4589808a7d34 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,4 +1,8 @@
-2004-06-25  Tobias Schlueter  <tobias.schlueter@physik.uni-muenchen.de>
+2004-06-29  Tobias Schlueter  <tobias.schlueter@physik.uni-muenchen.de>
+
+	* gfortran.fortran-torture/execute/parameter_2.f90: New test.
+
+2004-06-29  Tobias Schlueter  <tobias.schlueter@physik.uni-muenchen.de>
 
 	PR fortran/15963
 	* gfortran.fortran-torture/execute/initialization_1.f90: New test.
diff --git a/gcc/testsuite/gfortran.fortran-torture/execute/parameter_2.f90 b/gcc/testsuite/gfortran.fortran-torture/execute/parameter_2.f90
new file mode 100644
index 000000000000..1e9710472422
--- /dev/null
+++ b/gcc/testsuite/gfortran.fortran-torture/execute/parameter_2.f90
@@ -0,0 +1,7 @@
+module m
+  parameter (p = -1.) ! negative numbers used to get output incorrectly
+end module m
+
+use m
+if (p .ne. -1.) CALL abort()
+end