diff --git a/src/frontends/qt4/GuiInclude.cpp b/src/frontends/qt4/GuiInclude.cpp
index fe8cc3ba5b..e1fc275434 100644
--- a/src/frontends/qt4/GuiInclude.cpp
+++ b/src/frontends/qt4/GuiInclude.cpp
@@ -296,7 +296,6 @@ void GuiInclude::edit()
 {
 	if (!isValid())
 		return;
-	string const file = fromqstr(filenameED->text());
 	if (bc().policy().buttonStatus(ButtonPolicy::OKAY)) {
 		slotOK();
 		applyView();
diff --git a/src/insets/InsetGraphics.cpp b/src/insets/InsetGraphics.cpp
index bc82db732b..83cd84ddf0 100644
--- a/src/insets/InsetGraphics.cpp
+++ b/src/insets/InsetGraphics.cpp
@@ -503,7 +503,7 @@ copyToDirIfNeeded(DocFileName const & file, string const & dir)
 {
 	string const file_in = file.absFileName();
 	string const only_path = onlyPath(file_in);
-	if (rtrim(onlyPath(file_in) , "/") == rtrim(dir, "/"))
+	if (rtrim(only_path, "/") == rtrim(dir, "/"))
 		return make_pair(IDENTICAL_PATHS, FileName(file_in));
 
 	string mangled = file.mangledFileName();
diff --git a/src/insets/InsetQuotes.cpp b/src/insets/InsetQuotes.cpp
index 9682d661d7..01776a30fd 100644
--- a/src/insets/InsetQuotes.cpp
+++ b/src/insets/InsetQuotes.cpp
@@ -339,13 +339,12 @@ void InsetQuotes::forOutliner(docstring & os, size_t) const
 
 void InsetQuotes::validate(LaTeXFeatures & features) const
 {
-	bool const use_babel = features.useBabel();
 	char type = quote_char[quote_index[side_][language_]];
 
 #ifdef DO_USE_DEFAULT_LANGUAGE
 	if (features.bufferParams().language->lang() == "default"
 #else
-	if (!use_babel
+	if (!features.useBabel()
 #endif
 	    && lyxrc.fontenc != "T1") {
 		if (times_ == SingleQuotes)
diff --git a/src/output_latex.cpp b/src/output_latex.cpp
index 80cb990442..c14e8eea41 100644
--- a/src/output_latex.cpp
+++ b/src/output_latex.cpp
@@ -671,8 +671,6 @@ void TeXOnePar(Buffer const & buf,
 		getPolyglossiaEnvName(par_language): par_language->babel();
 	string const prev_lang = use_polyglossia ?
 		getPolyglossiaEnvName(prev_language) : prev_language->babel();
-	string const doc_lang = use_polyglossia ?
-		getPolyglossiaEnvName(doc_language) : doc_language->babel();
 	string const outer_lang = use_polyglossia ?
 		getPolyglossiaEnvName(outer_language) : outer_language->babel();
 	string lang_begin_command = use_polyglossia ?
diff --git a/src/tex2lyx/text.cpp b/src/tex2lyx/text.cpp
index 961d51d322..d16c52ed2a 100644
--- a/src/tex2lyx/text.cpp
+++ b/src/tex2lyx/text.cpp
@@ -2095,7 +2095,6 @@ void copy_file(FileName const & src, string dstname)
 		dst = FileName(dstname);
 	else
 		dst = makeAbsPath(dstname, absParent);
-	string const absMaster = getMasterFilePath(false);
 	FileName const srcpath = src.onlyPath();
 	FileName const dstpath = dst.onlyPath();
 	if (equivalent(srcpath, dstpath))