diff --git a/src/insets/insetcommand.C b/src/insets/insetcommand.C
index 6f58d51840..359b4decd0 100644
--- a/src/insets/insetcommand.C
+++ b/src/insets/insetcommand.C
@@ -95,7 +95,7 @@ int InsetCommand::latex(Buffer const &, odocstream & os,
 int InsetCommand::plaintext(Buffer const &, odocstream & os,
                             OutputParams const &) const
 {
-	docstring str = "[" + _("LaTeX Command: ") + from_utf8(getCmdName()) + "]";
+	docstring const str = "[" + _("LaTeX Command: ") + from_utf8(getCmdName()) + "]";
 	os << str;
 	return str.size();
 }
diff --git a/src/insets/insetgraphics.C b/src/insets/insetgraphics.C
index 407de303d1..a54307361e 100644
--- a/src/insets/insetgraphics.C
+++ b/src/insets/insetgraphics.C
@@ -818,8 +818,8 @@ int InsetGraphics::plaintext(Buffer const &, odocstream & os,
 	// FIXME UNICODE
 	// FIXME: We have no idea what the encoding of the filename is
 
-	docstring str = bformat(_("Graphics file: %1$s"),
-	                        from_utf8(params().filename.absFilename()));
+	docstring const str = bformat(_("Graphics file: %1$s"),
+	                              from_utf8(params().filename.absFilename()));
 	os << '<' << str << '>';
 
 	return 2 + str.size();
diff --git a/src/insets/insetinclude.C b/src/insets/insetinclude.C
index 0eaf0d5437..067df5ac4e 100644
--- a/src/insets/insetinclude.C
+++ b/src/insets/insetinclude.C
@@ -502,7 +502,7 @@ int InsetInclude::plaintext(Buffer const & buffer, odocstream & os,
 		os << "\n]";
 		return PLAINTEXT_NEWLINE + 1; // one char on a separate line
 	} else {
-		docstring str = '[' + getScreenLabel(buffer) + ']';
+		docstring const str = '[' + getScreenLabel(buffer) + ']';
 		os << str;
 		return str.size();
 	}
diff --git a/src/insets/insetlabel.C b/src/insets/insetlabel.C
index 682b98f546..bdac8f43a1 100644
--- a/src/insets/insetlabel.C
+++ b/src/insets/insetlabel.C
@@ -96,7 +96,7 @@ int InsetLabel::latex(Buffer const &, odocstream & os,
 int InsetLabel::plaintext(Buffer const &, odocstream & os,
                           OutputParams const &) const
 {
-	docstring str = getParam("name");
+	docstring const str = getParam("name");
 	os << '<' << str << '>';
 	return 2 + str.size();
 }
diff --git a/src/insets/insetquotes.C b/src/insets/insetquotes.C
index b9d1957be0..779b78d9e4 100644
--- a/src/insets/insetquotes.C
+++ b/src/insets/insetquotes.C
@@ -331,7 +331,7 @@ int InsetQuotes::latex(Buffer const &, odocstream & os,
 int InsetQuotes::plaintext(Buffer const & buf, odocstream & os,
                            OutputParams const &) const
 {
-	docstring str = dispString(buf.params().language);
+	docstring const str = dispString(buf.params().language);
 	os << str;
 	return str.size();
 }
diff --git a/src/insets/insetref.C b/src/insets/insetref.C
index dd7a79892b..85dca1c865 100644
--- a/src/insets/insetref.C
+++ b/src/insets/insetref.C
@@ -97,7 +97,7 @@ int InsetRef::latex(Buffer const &, odocstream & os,
 int InsetRef::plaintext(Buffer const &, odocstream & os,
                         OutputParams const &) const
 {
-	docstring str = getParam("reference");
+	docstring const str = getParam("reference");
 	os << '[' << str << ']';
 	return 2 + str.size();
 }
diff --git a/src/insets/inseturl.C b/src/insets/inseturl.C
index ff3e4229dd..eb67e6e117 100644
--- a/src/insets/inseturl.C
+++ b/src/insets/inseturl.C
@@ -81,7 +81,7 @@ int InsetUrl::plaintext(Buffer const &, odocstream & os,
 	else
 		oss << "||" << getParam("name") << ']';
 
-	docstring str = oss.str();
+	docstring const str = oss.str();
 	os << str;
 	return str.size();
 }