diff --git a/l10ntools/inc/export.hxx b/l10ntools/inc/export.hxx
index 251d059ac2c6..6cb6ba51233b 100644
--- a/l10ntools/inc/export.hxx
+++ b/l10ntools/inc/export.hxx
@@ -36,8 +36,6 @@
 
 #define NO_TRANSLATE_ISO        "x-no-translate"
 
-class MergeEntrys;
-
 typedef std::unordered_map<OString, OString>
     OStringHashMap;
 
@@ -68,10 +66,6 @@ public:
 
 
 
-class ParserQueue;
-
-
-
 /// Purpose: holds information of data to merge
 class MergeEntrys
 {
diff --git a/l10ntools/inc/po.hxx b/l10ntools/inc/po.hxx
index 9b33d2b7788e..b6e03ab8dfb1 100644
--- a/l10ntools/inc/po.hxx
+++ b/l10ntools/inc/po.hxx
@@ -16,8 +16,6 @@
 
 #include <rtl/string.hxx>
 
-class PoOfstream;
-class PoIfstream;
 class GenPoEntry;
 
 
diff --git a/l10ntools/inc/xmlparse.hxx b/l10ntools/inc/xmlparse.hxx
index 8e7d320affc5..5bf705b5aaf3 100644
--- a/l10ntools/inc/xmlparse.hxx
+++ b/l10ntools/inc/xmlparse.hxx
@@ -105,8 +105,6 @@ public:
 
 typedef std::vector< XMLChildNode* > XMLChildNodeList;
 
-class XMLData;
-
 /** Virtual base to handle different kinds of parent nodes
  */
 
diff --git a/linguistic/source/lngsvcmgr.hxx b/linguistic/source/lngsvcmgr.hxx
index fcec04f37237..3b676648f25a 100644
--- a/linguistic/source/lngsvcmgr.hxx
+++ b/linguistic/source/lngsvcmgr.hxx
@@ -45,10 +45,6 @@ struct SvcInfo;
 
 namespace com::sun::star::linguistic2 {
     class XLinguServiceEventBroadcaster;
-    class XSpellChecker;
-    class XProofreadingIterator;
-    class XHyphenator;
-    class XThesaurus;
 }