diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2c587a9..ebbadbb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 * `--version` option.
 * Added `--fonts` option for registering additional fonts. [#16](https://github.com/Zverik/Nik4/issues/16)
 * Fixed `--center` with `--scale` error. [#18](https://github.com/Zverik/Nik4/issues/18)
+* Swapped sizes 4A0 and 2A0. [#17](https://github.com/Zverik/Nik4/issues/17)
 
 ## 1.5, 7.12.2014
 
diff --git a/nik4.py b/nik4.py
index d57b940..4b8326b 100755
--- a/nik4.py
+++ b/nik4.py
@@ -132,9 +132,9 @@ def get_paper_size(name):
 	if m:
 		return [math.floor(1000 / 2**((int(m.group(1)) - 1) / 2.0) + 0.2), math.floor(1000 / 2**(int(m.group(1)) / 2.0) + 0.2)]
 	# German extensions
-	if name == '2a0':
-		return [2378, 1682]
 	if name == '4a0':
+		return [2378, 1682]
+	if name == '2a0':
 		return [1682, 1189]
 	# US Legal
 	if re.match(r'^leg', name):