diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 7761b46b3b..edb9c78307 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -3906,7 +3906,7 @@ void GLCanvas3D::_picking_pass() const
             m_gizmos.set_hover_id(-1);
         }
         else
-            m_gizmos.set_hover_id(inside && volume_id <= (int)GLGizmoBase::BASE_ID ? ((int)GLGizmoBase::BASE_ID - volume_id) : -1);
+            m_gizmos.set_hover_id(inside && (unsigned int)volume_id <= GLGizmoBase::BASE_ID ? ((int)GLGizmoBase::BASE_ID - volume_id) : -1);
 
         _update_volumes_hover_state();
     }
diff --git a/src/slic3r/GUI/PrintHostDialogs.cpp b/src/slic3r/GUI/PrintHostDialogs.cpp
index 09bd656828..d083895379 100644
--- a/src/slic3r/GUI/PrintHostDialogs.cpp
+++ b/src/slic3r/GUI/PrintHostDialogs.cpp
@@ -250,7 +250,7 @@ void PrintHostQueueDialog::on_list_select()
 
 void PrintHostQueueDialog::on_progress(Event &evt)
 {
-    wxCHECK_RET(evt.job_id < job_list->GetItemCount(), "Out of bounds access to job list");
+    wxCHECK_RET(evt.job_id < (size_t)job_list->GetItemCount(), "Out of bounds access to job list");
 
     if (evt.progress < 100) {
         set_state(evt.job_id, ST_PROGRESS);
@@ -265,7 +265,7 @@ void PrintHostQueueDialog::on_progress(Event &evt)
 
 void PrintHostQueueDialog::on_error(Event &evt)
 {
-    wxCHECK_RET(evt.job_id < job_list->GetItemCount(), "Out of bounds access to job list");
+    wxCHECK_RET(evt.job_id < (size_t)job_list->GetItemCount(), "Out of bounds access to job list");
 
     set_state(evt.job_id, ST_ERROR);
 
@@ -280,7 +280,7 @@ void PrintHostQueueDialog::on_error(Event &evt)
 
 void PrintHostQueueDialog::on_cancel(Event &evt)
 {
-    wxCHECK_RET(evt.job_id < job_list->GetItemCount(), "Out of bounds access to job list");
+    wxCHECK_RET(evt.job_id < (size_t)job_list->GetItemCount(), "Out of bounds access to job list");
 
     set_state(evt.job_id, ST_CANCELLED);
     job_list->SetValue(wxVariant(0), evt.job_id, COL_PROGRESS);
diff --git a/src/slic3r/GUI/PrintHostDialogs.hpp b/src/slic3r/GUI/PrintHostDialogs.hpp
index 427c4f6bff..e5f96f2b62 100644
--- a/src/slic3r/GUI/PrintHostDialogs.hpp
+++ b/src/slic3r/GUI/PrintHostDialogs.hpp
@@ -37,7 +37,6 @@ public:
 private:
     wxTextCtrl *txt_filename;
     wxCheckBox *box_print;
-    bool can_start_print;
 };
 
 
diff --git a/src/slic3r/GUI/UpdateDialogs.cpp b/src/slic3r/GUI/UpdateDialogs.cpp
index a1a113066f..d2a5e185a8 100644
--- a/src/slic3r/GUI/UpdateDialogs.cpp
+++ b/src/slic3r/GUI/UpdateDialogs.cpp
@@ -34,10 +34,8 @@ static const std::string CONFIG_UPDATE_WIKI_URL("https://github.com/prusa3d/Prus
 
 // MsgUpdateSlic3r
 
-MsgUpdateSlic3r::MsgUpdateSlic3r(const Semver &ver_current, const Semver &ver_online) :
-	MsgDialog(nullptr, _(L("Update available")), wxString::Format(_(L("New version of %s is available")), SLIC3R_APP_NAME)),
-	ver_current(ver_current),
-	ver_online(ver_online)
+MsgUpdateSlic3r::MsgUpdateSlic3r(const Semver &ver_current, const Semver &ver_online)
+	: MsgDialog(nullptr, _(L("Update available")), wxString::Format(_(L("New version of %s is available")), SLIC3R_APP_NAME))
 {
 	const bool dev_version = ver_online.prerelease() != nullptr;
 
diff --git a/src/slic3r/GUI/UpdateDialogs.hpp b/src/slic3r/GUI/UpdateDialogs.hpp
index 4b61b84c23..a916e0145e 100644
--- a/src/slic3r/GUI/UpdateDialogs.hpp
+++ b/src/slic3r/GUI/UpdateDialogs.hpp
@@ -31,8 +31,6 @@ public:
 	bool disable_version_check() const;
 
 private:
-	const Semver &ver_current;
-	const Semver &ver_online;
 	wxCheckBox *cbox;
 };