diff --git a/System/X509.hs b/System/X509.hs
--- a/System/X509.hs
+++ b/System/X509.hs
@@ -7,8 +7,8 @@
 -- Portability : good
 --
 module System.X509
-	( getSystemCertificateStore
-	) where
+    ( getSystemCertificateStore
+    ) where
 
 #if defined(WINDOWS)
 import System.X509.Win32
diff --git a/System/X509/MacOS.hs b/System/X509/MacOS.hs
--- a/System/X509/MacOS.hs
+++ b/System/X509/MacOS.hs
@@ -1,6 +1,6 @@
 module System.X509.MacOS
-	( getSystemCertificateStore
-	) where
+    ( getSystemCertificateStore
+    ) where
 
 import Data.PEM (pemParseLBS, PEM(..))
 import System.Process
diff --git a/x509-system.cabal b/x509-system.cabal
--- a/x509-system.cabal
+++ b/x509-system.cabal
@@ -1,5 +1,5 @@
 Name:                x509-system
-version:             1.6.5
+version:             1.6.6
 Description:         System X.509 handling
 License:             BSD3
 License-file:        LICENSE