diff --git a/src/croatian/ExtendHrv.gf b/src/croatian/ExtendHrv.gf
index 5fa1d39c4..8eba3b1f7 100644
--- a/src/croatian/ExtendHrv.gf
+++ b/src/croatian/ExtendHrv.gf
@@ -26,6 +26,8 @@ concrete ExtendHrv of Extend = CatHrv **
     ,ComplBareVS
     ,CompIQuant
     ,CompBareCN
+    ,PiedPipingQuestSlash
+    ,PiedPipingRelSlash
     ]
   with (Grammar = GrammarHrv)
     **
diff --git a/src/czech/ExtendCze.gf b/src/czech/ExtendCze.gf
index 12659f690..de797dd6b 100644
--- a/src/czech/ExtendCze.gf
+++ b/src/czech/ExtendCze.gf
@@ -25,6 +25,8 @@ concrete ExtendCze of Extend = CatCze **
     ,ComplBareVS
     ,CompIQuant
     ,CompBareCN
+    ,PiedPipingQuestSlash
+    ,PiedPipingRelSlash
     ]
   with (Grammar = GrammarCze)
     **
@@ -35,4 +37,4 @@ in {
 lin ReflPossPron = justDemPronFormsAdjective reflPossessivePron ;
 
 
-}
\ No newline at end of file
+}
diff --git a/src/slovak/ExtendSlo.gf b/src/slovak/ExtendSlo.gf
index c5ff3c5fb..86732cb00 100644
--- a/src/slovak/ExtendSlo.gf
+++ b/src/slovak/ExtendSlo.gf
@@ -25,6 +25,8 @@ concrete ExtendSlo of Extend = CatSlo **
     ,ComplBareVS
     ,CompIQuant
     ,CompBareCN
+    ,PiedPipingQuestSlash
+    ,PiedPipingRelSlash
     ]
   with (Grammar = GrammarSlo)
     **
@@ -35,4 +37,4 @@ in {
 lin ReflPossPron = justDemPronFormsAdjective reflPossessivePron ;
 
 
-}
\ No newline at end of file
+}