diff --git a/language/duchain/classmemberdeclaration.h b/language/duchain/classmemberdeclaration.h
--- a/language/duchain/classmemberdeclaration.h
+++ b/language/duchain/classmemberdeclaration.h
@@ -52,7 +52,6 @@
     NativeSpecifier   = 0x80,
     SynchronizedSpecifier = 0x100,
     StrictFPSpecifier = 0x200,
-    AbstractSpecifier = 0x400
   };
   Q_DECLARE_FLAGS(StorageSpecifiers, StorageSpecifier)
 
@@ -85,9 +84,6 @@
   bool isStrictFP() const;
   void setStrictFP(bool strictFP);
 
-  bool isAbstract() const;
-  void setAbstract(bool abstract);
-
   enum {
     Identity = 9
   };
diff --git a/language/duchain/classmemberdeclaration.cpp b/language/duchain/classmemberdeclaration.cpp
--- a/language/duchain/classmemberdeclaration.cpp
+++ b/language/duchain/classmemberdeclaration.cpp
@@ -38,7 +38,6 @@
     , m_isNative(false)
     , m_isSynchronized(false)
     , m_isStrictFP(false)
-    , m_isAbstract(false)
 {
 }
 
@@ -173,16 +172,6 @@
   d_func_dynamic()->m_isSynchronized = synchronized;
 }
 
-bool ClassMemberDeclaration::isAbstract() const
-{
-  return d_func()->m_isAbstract;
-}
-
-void ClassMemberDeclaration::setAbstract(bool abstract)
-{
-  d_func_dynamic()->m_isAbstract = abstract;
-}
-
 
 void ClassMemberDeclaration::setStorageSpecifiers(StorageSpecifiers specifiers)
 {
@@ -197,6 +186,5 @@
   d->m_isSynchronized = specifiers & SynchronizedSpecifier;
   d->m_isNative = specifiers & NativeSpecifier;
   d->m_isStrictFP = specifiers & StrictFPSpecifier;
-  d->m_isAbstract = specifiers & AbstractSpecifier;
 }
 }
diff --git a/language/duchain/classmemberdeclarationdata.h b/language/duchain/classmemberdeclarationdata.h
--- a/language/duchain/classmemberdeclarationdata.h
+++ b/language/duchain/classmemberdeclarationdata.h
@@ -45,7 +45,6 @@
   bool m_isNative: 1;
   bool m_isSynchronized: 1;
   bool m_isStrictFP: 1;
-  bool m_isAbstract: 1;
 };
 
 }
diff --git a/tests/json/jsondeclarationtests.h b/tests/json/jsondeclarationtests.h
--- a/tests/json/jsondeclarationtests.h
+++ b/tests/json/jsondeclarationtests.h
@@ -30,7 +30,7 @@
 #include "language/duchain/duchain.h"
 #include "language/duchain/functiondefinition.h"
 #include "language/duchain/definitions.h"
-#include <language/duchain/classmemberdeclaration.h>
+#include <language/duchain/classfunctiondeclaration.h>
 #include "jsontesthelpers.h"
 
 /**
@@ -205,7 +205,7 @@
 DeclarationTest(isAbstract)
 {
   const QString NOT_A_FUNCTION = QStringLiteral("Non-class-member declaration cannot be abstract.");
-  auto *absFuncDecl = dynamic_cast<ClassMemberDeclaration*>(decl);
+  auto *absFuncDecl = dynamic_cast<ClassFunctionDeclaration*>(decl);
   if (!absFuncDecl)
       return NOT_A_FUNCTION;