diff --git a/src/pgsql/copy-format.lisp b/src/pgsql/copy-format.lisp
index 92e97ca..bf104d7 100644
--- a/src/pgsql/copy-format.lisp
+++ b/src/pgsql/copy-format.lisp
@@ -78,7 +78,7 @@ details about the format, and format specs."
                            (t
                             (if (<= 32 byte 127)
                                 (write-bytes (code-char byte))
-                                (write-bytes (format nil "\\~o" byte))))))))
+                                (write-bytes (format nil "\\~3,'0o" byte))))))))
          when more? do (write-bytes #\Tab)
          finally       (progn (write-bytes #\Newline)
                               (return bytes))))))
diff --git a/test/Makefile b/test/Makefile
index bee62aa..a6cc71a 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -14,6 +14,7 @@ REGRESS= allcols.load 		    \
          csv-header.load            \
          csv-json.load              \
          csv-keep-extra-blanks.load \
+         csv-non-printable.load     \
          csv-nulls.load             \
          csv-trim-extra-blanks.load \
          csv.load 		    \
diff --git a/test/csv-non-printable.load b/test/csv-non-printable.load
new file mode 100644
index 0000000..f172b4f
--- /dev/null
+++ b/test/csv-non-printable.load
@@ -0,0 +1,29 @@
+--
+-- From https://github.com/dimitri/pgloader/issues/275
+--
+
+LOAD CSV
+   FROM inline with encoding 'LATIN1'
+   INTO postgresql:///pgloader?tab_csv
+   WITH truncate,
+        skip header = 0,
+        fields terminated by ',',
+        fields optionally enclosed by '"'
+
+   BEFORE LOAD DO
+     $$ drop table if exists tab_csv; $$,
+     $$ create table tab_csv
+          (c1 varchar(100),
+           c2 varchar(100),
+           c3 varchar(100));
+     $$
+
+;
+
+col1, 45, "005 45 works"
+col1, 44, "006 44 Fails 0xa5"
+col1, 45, "006 45 Fails 0xa6"
+col1, "45", "006 45 Fails using escape 0xa6"
+col1, 46, "006 46 Fails 0xa7"
+col1, 47, "006 47 Fails 0xa8"
+col1, 4T works, "006 followed by 4 works ? why"
\ No newline at end of file
diff --git a/test/regress/expected/csv-non-printable.out b/test/regress/expected/csv-non-printable.out
new file mode 100644
index 0000000..17308b0
--- /dev/null
+++ b/test/regress/expected/csv-non-printable.out
@@ -0,0 +1,7 @@
+col1	45	005 45 works
+col1	44	006 44 Fails 0xa5
+col1	45	006 45 Fails 0xa6
+col1	45	006 45 Fails using escape 0xa6
+col1	46	006 46 Fails 0xa7
+col1	47	006 47 Fails 0xa8
+col1	4T works	006 followed by 4 works ? why