diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 94f7e77f928..6b69a63185a 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2010-07-12  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+
+	PR libfortran/37077
+	* gfortran.dg/char4_iunit_1.f03: New test.
+
 2010-07-12  Jakub Jelinek  <jakub@redhat.com>
 
 	* gcc.dg/tree-ssa/vrp53.c: New test.
diff --git a/gcc/testsuite/gfortran.dg/char4_iunit_1.f03 b/gcc/testsuite/gfortran.dg/char4_iunit_1.f03
new file mode 100644
index 00000000000..98e5cdd070c
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/char4_iunit_1.f03
@@ -0,0 +1,32 @@
+! { dg-do run }
+! PR37077 Implement Internal Unit I/O for character KIND=4
+! Test case prepared by Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+program char4_iunit_1
+  implicit none
+  character(kind=4,len=42) :: string
+  integer(kind=4) :: i,j
+  real(kind=4) :: inf, nan, large
+
+  large = huge(large)
+  inf = 2 * large
+  nan = 0
+  nan = nan / nan
+
+  string = 4_"123456789x"
+  write(string,'(a11)') 4_"abcdefg"
+  if (string .ne. 4_"    abcdefg                               ") call abort
+  write(string,*) 12345
+  if (string .ne. 4_"       12345                              ") call abort
+  write(string, '(i6,5x,i8,a5)') 78932, 123456, "abc"
+  if (string .ne. 4_" 78932       123456  abc                  ") call abort
+  write(string, *) .true., .false. , .true.
+  if (string .ne. 4_" T F T                                    ") call abort
+  write(string, *) 1.2345e-06, 4.2846e+10_8
+  if (string .ne. 4_"  1.23450002E-06   42846000000.000000     ") call abort
+  write(string, *) nan, inf
+  if (string .ne. 4_"             NaN       +Infinity           ") call abort
+  write(string, '(10x,f3.1,3x,f9.1)') nan, inf
+  if (string .ne. 4_"          NaN   +Infinity                 ") call abort
+  write(string, *) (1.2, 3.4 )
+  if (string .ne. 4_" (  1.2000000    ,  3.4000001    )        ") call abort
+end program char4_iunit_1