1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 35b6523..4f03424 100644
--- a/Makefile
+++ b/Makefile
@@ -23,7 +23,7 @@ tests/suite: tests/suite.hs Data/OpenPGP.hs Data/OpenPGP/Internal.hs Data/OpenPG
         ghc --make $(GHCFLAGS) -o $@ $^
 
 Data/OpenPGP/Arbitrary.hs: Data/OpenPGP.hs Arbitrary.patch
-        derive -d Arbitrary -m Data.OpenPGP.Arbitrary -iData.OpenPGP -iTest.QuickCheck -iTest.QuickCheck.Instances -iNumeric -iData.Char -iData.Word -o $@ Data/OpenPGP.hs
+        derive -d Arbitrary -m Data.OpenPGP.Arbitrary -iData.OpenPGP -iData.OpenPGP.Internal -iTest.QuickCheck -iTest.QuickCheck.Instances -iNumeric -iData.Char -iData.Word -o $@ Data/OpenPGP.hs
         patch $@ Arbitrary.patch
 
 report.html: tests/suite.hs Data/OpenPGP.hs Data/OpenPGP/Internal.hs