diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index f4e055fdc89..2ba0cbf71c5 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2013-12-18  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	* gfortran.dg/io_err_1.f90: New test.
+
 2013-12-18  Balaji V. Iyer  <balaji.v.iyer@intel.com>
 
 	* c-c++-common/cilk-plus/SE/ef_test.c: New test.
diff --git a/gcc/testsuite/gfortran.dg/io_err_1.f90 b/gcc/testsuite/gfortran.dg/io_err_1.f90
new file mode 100644
index 00000000000..4159a041a72
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/io_err_1.f90
@@ -0,0 +1,14 @@
+! { dg-do run }
+! { dg-shouldfail "Compile-time specifier checking" }
+!
+! Contributed by Dominique Dhumieres <dominiq at lps dot ens dot fr>
+program read
+   character(50) :: buf='0.D99999'
+   double precision val
+   read (UNIT=buf, FMT='(D60.0)', ERR=10) Val
+   call abort
+10 read (UNIT=buf, FMT='(D60.0)') Val
+end program read
+! { dg-output "At line 10 of file.*" }
+! { dg-output "Fortran runtime error: Bad value during floating point read" }
+
diff --git a/libgfortran/ChangeLog b/libgfortran/ChangeLog
index 309712c012b..7bfb2c1242b 100644
--- a/libgfortran/ChangeLog
+++ b/libgfortran/ChangeLog
@@ -1,3 +1,7 @@
+2013-12-18  Steven G. Kargl  <kargl@gcc.gnu.org>
+
+	* io/read.c (read_f): Convert assert to runtime error.
+
 2013-12-17  Andreas Tobler  <andreast@gcc.gnu.org>
 
 	* io/unix.c (tempfile_open): Only use the needed flag O_CLOEXEC.
diff --git a/libgfortran/io/read.c b/libgfortran/io/read.c
index e35b1a06168..f0de14c4651 100644
--- a/libgfortran/io/read.c
+++ b/libgfortran/io/read.c
@@ -1150,7 +1150,9 @@ done:
 	  exponent = - exponent;
 	}
 
-      assert (exponent < 10000);
+      if (exponent >= 10000)
+	goto bad_float;
+
       for (dig = 3; dig >= 0; --dig)
 	{
 	  out[dig] = (char) ('0' + exponent % 10);