diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 5bc85a0be42..ad8229a0165 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2003-08-08  Richard Sandiford  <rsandifo@redhat.com>
+
+	* tree.c (get_file_function_name_long): Fix size of alloca() area.
+
 2003-08-08  Kelley Cook  <kelleycook@wideopenwest.com>
 
 	* configure.in (gcc_cv_prog_cmp_skip): Flipflop make_compare_target
diff --git a/gcc/tree.c b/gcc/tree.c
index 7ac0402dd01..4bbb9079376 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -4517,7 +4517,7 @@ get_file_function_name_long (const char *type)
 	file = input_filename;
 
       len = strlen (file);
-      q = alloca (9 * 2 + len);
+      q = alloca (9 * 2 + len + 1);
       memcpy (q, file, len + 1);
       clean_symbol_name (q);