diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index b65a21fc86b7..bc9738a1bebf 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,3 +1,9 @@
+2011-01-09  Janus Weil  <janus@gcc.gnu.org>
+
+	PR fortran/46313
+	* class.c (get_unique_type_string): Make type name start with upper
+	case letter.
+
 2011-01-08  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/46405
diff --git a/gcc/fortran/class.c b/gcc/fortran/class.c
index d07df87b088b..2227f9e72f3d 100644
--- a/gcc/fortran/class.c
+++ b/gcc/fortran/class.c
@@ -116,13 +116,16 @@ gfc_class_null_initializer (gfc_typespec *ts)
 
 static void
 get_unique_type_string (char *string, gfc_symbol *derived)
-{  
+{
+  char dt_name[GFC_MAX_SYMBOL_LEN+1];
+  sprintf (dt_name, "%s", derived->name);
+  dt_name[0] = TOUPPER (dt_name[0]);
   if (derived->module)
-    sprintf (string, "%s_%s", derived->module, derived->name);
+    sprintf (string, "%s_%s", derived->module, dt_name);
   else if (derived->ns->proc_name)
-    sprintf (string, "%s_%s", derived->ns->proc_name->name, derived->name);
+    sprintf (string, "%s_%s", derived->ns->proc_name->name, dt_name);
   else
-    sprintf (string, "_%s", derived->name);
+    sprintf (string, "_%s", dt_name);
 }
 
 
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 39777861bc53..97d5ce46298f 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2011-01-09  Janus Weil  <janus@gcc.gnu.org>
+
+	PR fortran/46313
+	* gfortran.dg/class_35.f90: New.
+
 2011-01-08  Iain Sandoe  <iains@gcc.gnu.org>
 
 	* objc.dg/foreach-1.m: Add "-Wall" to flags.
diff --git a/gcc/testsuite/gfortran.dg/class_35.f90 b/gcc/testsuite/gfortran.dg/class_35.f90
new file mode 100644
index 000000000000..1b5502a78703
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/class_35.f90
@@ -0,0 +1,26 @@
+! { dg-do run }
+!
+! PR 46313: [OOP] class container naming collisions
+!
+! Contributed by Tobias Burnus <burnus@gcc.gnu.org>
+
+module one
+  type two_three
+  end type
+end module
+
+module one_two
+  type three
+  end type
+end module
+
+use one
+use one_two
+class(two_three), allocatable :: a1
+class(three), allocatable :: a2
+
+if (same_type_as(a1,a2)) call abort()
+
+end 
+
+! { dg-final { cleanup-modules "one one_two" } }