12 files changed, 23 insertions, 0 deletions
diff --git a/compiler/iface/BinFingerprint.hs b/compiler/iface/BinFingerprint.hs
index bbf45d7d0c..913ece0f27 100644
--- a/compiler/iface/BinFingerprint.hs
+++ b/compiler/iface/BinFingerprint.hs
@@ -10,6 +10,8 @@ module BinFingerprint
 
 #include "HsVersions.h"
 
+import GhcPrelude
+
 import Fingerprint
 import Binary
 import Name
diff --git a/compiler/iface/BinIface.hs b/compiler/iface/BinIface.hs
index f658d7f156..969dc85c04 100644
--- a/compiler/iface/BinIface.hs
+++ b/compiler/iface/BinIface.hs
@@ -20,6 +20,8 @@ module BinIface (
 
 #include "HsVersions.h"
 
+import GhcPrelude
+
 import TcRnMonad
 import PrelInfo   ( isKnownKeyName, lookupKnownKeyName )
 import IfaceEnv
diff --git a/compiler/iface/BuildTyCl.hs b/compiler/iface/BuildTyCl.hs
index a5b724994c..4eb8271477 100644
--- a/compiler/iface/BuildTyCl.hs
+++ b/compiler/iface/BuildTyCl.hs
@@ -15,6 +15,8 @@ module BuildTyCl (
 
 #include "HsVersions.h"
 
+import GhcPrelude
+
 import IfaceEnv
 import FamInstEnv( FamInstEnvs, mkNewTypeCoAxiom )
 import TysWiredIn( isCTupleTyConName )
diff --git a/compiler/iface/FlagChecker.hs b/compiler/iface/FlagChecker.hs
index fd0459d6cc..eb99c743e6 100644
--- a/compiler/iface/FlagChecker.hs
+++ b/compiler/iface/FlagChecker.hs
@@ -6,6 +6,8 @@ module FlagChecker (
         fingerprintDynFlags
     ) where
 
+import GhcPrelude
+
 import Binary
 import BinIface ()
 import DynFlags
diff --git a/compiler/iface/IfaceEnv.hs b/compiler/iface/IfaceEnv.hs
index f66ebdc321..285bb2899c 100644
--- a/compiler/iface/IfaceEnv.hs
+++ b/compiler/iface/IfaceEnv.hs
@@ -22,6 +22,8 @@ module IfaceEnv (
 
 #include "HsVersions.h"
 
+import GhcPrelude
+
 import TcRnMonad
 import HscTypes
 import Type
diff --git a/compiler/iface/IfaceSyn.hs b/compiler/iface/IfaceSyn.hs
index 1373fb0fcb..191ebbf368 100644
--- a/compiler/iface/IfaceSyn.hs
+++ b/compiler/iface/IfaceSyn.hs
@@ -41,6 +41,8 @@ module IfaceSyn (
 
 #include "HsVersions.h"
 
+import GhcPrelude
+
 import IfaceType
 import BinFingerprint
 import CoreSyn( IsOrphan, isOrphan )
diff --git a/compiler/iface/IfaceType.hs b/compiler/iface/IfaceType.hs
index 3475366e31..096430e04f 100644
--- a/compiler/iface/IfaceType.hs
+++ b/compiler/iface/IfaceType.hs
@@ -49,6 +49,8 @@ module IfaceType (
 
 #include "HsVersions.h"
 
+import GhcPrelude
+
 import {-# SOURCE #-} TysWiredIn ( liftedRepDataConTyCon )
 
 import DynFlags
diff --git a/compiler/iface/LoadIface.hs b/compiler/iface/LoadIface.hs
index 01fdaacd9f..60698287a0 100644
--- a/compiler/iface/LoadIface.hs
+++ b/compiler/iface/LoadIface.hs
@@ -32,6 +32,8 @@ module LoadIface (
 
 #include "HsVersions.h"
 
+import GhcPrelude
+
 import {-# SOURCE #-}   TcIface( tcIfaceDecl, tcIfaceRules, tcIfaceInst,
                                  tcIfaceFamInst, tcIfaceVectInfo,
                                  tcIfaceAnnotations, tcIfaceCompleteSigs )
diff --git a/compiler/iface/MkIface.hs b/compiler/iface/MkIface.hs
index 94ace18545..184ee48984 100644
--- a/compiler/iface/MkIface.hs
+++ b/compiler/iface/MkIface.hs
@@ -58,6 +58,8 @@ Basic idea:
 
 #include "HsVersions.h"
 
+import GhcPrelude
+
 import IfaceSyn
 import BinFingerprint
 import LoadIface
diff --git a/compiler/iface/TcIface.hs b/compiler/iface/TcIface.hs
index d17e2351e3..8633658dd9 100644
--- a/compiler/iface/TcIface.hs
+++ b/compiler/iface/TcIface.hs
@@ -22,6 +22,8 @@ module TcIface (
 
 #include "HsVersions.h"
 
+import GhcPrelude
+
 import TcTypeNats(typeNatCoAxiomRules)
 import IfaceSyn
 import LoadIface
diff --git a/compiler/iface/TcIface.hs-boot b/compiler/iface/TcIface.hs-boot
index 4a99114fc0..dbc5ff14f8 100644
--- a/compiler/iface/TcIface.hs-boot
+++ b/compiler/iface/TcIface.hs-boot
@@ -1,5 +1,6 @@
 module TcIface where
 
+import GhcPrelude
 import IfaceSyn    ( IfaceDecl, IfaceClsInst, IfaceFamInst, IfaceRule,
                      IfaceAnnotation, IfaceCompleteMatch )
 import TyCoRep     ( TyThing )
diff --git a/compiler/iface/ToIface.hs b/compiler/iface/ToIface.hs
index f5cbe9e5c7..9eceb6d750 100644
--- a/compiler/iface/ToIface.hs
+++ b/compiler/iface/ToIface.hs
@@ -44,6 +44,8 @@ module ToIface
 
 #include "HsVersions.h"
 
+import GhcPrelude
+
 import IfaceSyn
 import DataCon
 import Id