diff --git a/cabal-install/tests/UnitTests/Distribution/Client/ProjectConfig.hs b/cabal-install/tests/UnitTests/Distribution/Client/ProjectConfig.hs
index cdb34a3534c..55fee5337bc 100644
--- a/cabal-install/tests/UnitTests/Distribution/Client/ProjectConfig.hs
+++ b/cabal-install/tests/UnitTests/Distribution/Client/ProjectConfig.hs
@@ -646,7 +646,7 @@ instance Arbitrary ProjectConfigShared where
 
 projectConfigConstraintSource :: ConstraintSource
 projectConfigConstraintSource =
-  ConstraintSourceProjectConfig "unused"
+  ConstraintSourceProjectConfig $ ProjectConfigImport 0 "unused"
 
 instance Arbitrary ProjectConfigProvenance where
   arbitrary = elements [Implicit, Explicit "cabal.project"]
diff --git a/cabal-install/tests/UnitTests/Distribution/Client/TreeDiffInstances.hs b/cabal-install/tests/UnitTests/Distribution/Client/TreeDiffInstances.hs
index 495c4cbf402..bd49744e092 100644
--- a/cabal-install/tests/UnitTests/Distribution/Client/TreeDiffInstances.hs
+++ b/cabal-install/tests/UnitTests/Distribution/Client/TreeDiffInstances.hs
@@ -39,6 +39,7 @@ instance ToExpr AllowOlder
 instance ToExpr BuildReport
 instance ToExpr ClientInstallFlags
 instance ToExpr CombineStrategy
+instance ToExpr ProjectConfigImport
 instance ToExpr ConstraintSource
 instance ToExpr CountConflicts
 instance ToExpr FineGrainedConflicts