diff --git a/src/plugins/debugger/debuggerengine.cpp b/src/plugins/debugger/debuggerengine.cpp
index 4a904c91ce9..77fcbde60ce 100644
--- a/src/plugins/debugger/debuggerengine.cpp
+++ b/src/plugins/debugger/debuggerengine.cpp
@@ -1273,11 +1273,6 @@ void DebuggerEngine::addOptionPages(QList<IOptionsPage*> *) const
 {
 }
 
-bool DebuggerEngine::isSynchronous() const
-{
-    return false;
-}
-
 QString DebuggerEngine::qtNamespace() const
 {
     return d->m_qtNamespace;
diff --git a/src/plugins/debugger/debuggerengine.h b/src/plugins/debugger/debuggerengine.h
index c02271ab2f6..9d1ffaca8cd 100644
--- a/src/plugins/debugger/debuggerengine.h
+++ b/src/plugins/debugger/debuggerengine.h
@@ -301,7 +301,6 @@ public:
     virtual bool hasCapability(unsigned cap) const = 0;
     virtual void debugLastCommand() {}
 
-    virtual bool isSynchronous() const;
     virtual QString qtNamespace() const;
     void setQtNamespace(const QString &ns);
 
diff --git a/src/plugins/debugger/gdb/gdbengine.h b/src/plugins/debugger/gdb/gdbengine.h
index fcf1e0f2f3d..8c225b6288d 100644
--- a/src/plugins/debugger/gdb/gdbengine.h
+++ b/src/plugins/debugger/gdb/gdbengine.h
@@ -176,8 +176,6 @@ private: ////////// General Interface //////////
     void handleStop3();
     void resetCommandQueue();
 
-    bool isSynchronous() const final { return true; }
-
     // Gdb initialization sequence
     void handleShowVersion(const DebuggerResponse &response);
     void handleListFeatures(const DebuggerResponse &response);
diff --git a/src/plugins/debugger/lldb/lldbengine.h b/src/plugins/debugger/lldb/lldbengine.h
index f52cf3dd99d..55bd6b603fe 100644
--- a/src/plugins/debugger/lldb/lldbengine.h
+++ b/src/plugins/debugger/lldb/lldbengine.h
@@ -110,7 +110,6 @@ private:
     void reloadDebuggingHelpers() override;
     void fetchDisassembler(Internal::DisassemblerAgent *) override;
 
-    bool isSynchronous() const override { return true; }
     void setRegisterValue(const QString &name, const QString &value) override;
 
     void fetchMemory(MemoryAgent *, quint64 addr, quint64 length) override;
diff --git a/src/plugins/debugger/pdb/pdbengine.h b/src/plugins/debugger/pdb/pdbengine.h
index b6120e3aecb..ccef9d1e479 100644
--- a/src/plugins/debugger/pdb/pdbengine.h
+++ b/src/plugins/debugger/pdb/pdbengine.h
@@ -88,7 +88,6 @@ private:
     void reloadFullStack() override {}
 
     bool supportsThreads() const { return true; }
-    bool isSynchronous() const override { return true; }
     void updateItem(const QString &iname) override;
 
     void runCommand(const DebuggerCommand &cmd) override;
diff --git a/src/plugins/debugger/qml/qmlcppengine.cpp b/src/plugins/debugger/qml/qmlcppengine.cpp
index 1a920f5f3ef..3353712dda3 100644
--- a/src/plugins/debugger/qml/qmlcppengine.cpp
+++ b/src/plugins/debugger/qml/qmlcppengine.cpp
@@ -207,11 +207,6 @@ bool QmlCppEngine::hasCapability(unsigned cap) const
     return hasCap;
 }
 
-bool QmlCppEngine::isSynchronous() const
-{
-    return m_activeEngine->isSynchronous();
-}
-
 QString QmlCppEngine::qtNamespace() const
 {
     return m_cppEngine->qtNamespace();
diff --git a/src/plugins/debugger/qml/qmlcppengine.h b/src/plugins/debugger/qml/qmlcppengine.h
index a8a0d615377..fffd08a89aa 100644
--- a/src/plugins/debugger/qml/qmlcppengine.h
+++ b/src/plugins/debugger/qml/qmlcppengine.h
@@ -65,7 +65,6 @@ public:
     void setRegisterValue(const QString &name, const QString &value) override;
     bool hasCapability(unsigned cap) const override;
 
-    bool isSynchronous() const override;
     QString qtNamespace() const override;
 
     void createSnapshot() override;
diff --git a/src/plugins/debugger/qml/qmlengine.h b/src/plugins/debugger/qml/qmlengine.h
index 2f6889b62b1..bdd6b2d64cd 100644
--- a/src/plugins/debugger/qml/qmlengine.h
+++ b/src/plugins/debugger/qml/qmlengine.h
@@ -70,7 +70,6 @@ private:
     void gotoLocation(const Internal::Location &location) override;
     void insertBreakpoint(Breakpoint bp) override;
 
-    bool isSynchronous() const override { return false; }
     bool canDisplayTooltip() const override { return false; }
 
     void resetLocation() override;