diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index 9efb2d4c79..f52423d24d 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -820,7 +820,6 @@ bool Buffer::readDocument(Lexer & lex)
 	// read main text
 	bool const res = text().read(lex, errorList, d->inset);
 
-	usermacros.clear();
 	updateMacros();
 	updateMacroInstances();
 	return res;
diff --git a/src/Buffer.h b/src/Buffer.h
index d0d787687c..e79856609f 100644
--- a/src/Buffer.h
+++ b/src/Buffer.h
@@ -542,10 +542,6 @@ public:
 	/// Return macro defined before the inclusion of the child
 	MacroData const * getMacro(docstring const & name, Buffer const & child, bool global = true) const;
 
-	/// Collect user macro names at loading time
-	typedef std::set<docstring> UserMacroSet;
-	UserMacroSet usermacros;
-
 	/// Replace the inset contents for insets which InsetCode is equal
 	/// to the passed \p inset_code.
 	void changeRefsIfUnique(docstring const & from, docstring const & to,
diff --git a/src/mathed/MathParser.cpp b/src/mathed/MathParser.cpp
index 4767dc1536..f86a762be8 100644
--- a/src/mathed/MathParser.cpp
+++ b/src/mathed/MathParser.cpp
@@ -1060,9 +1060,6 @@ bool Parser::parse1(InsetMathGrid & grid, unsigned flags,
 			cell->push_back(MathAtom(new MathMacroTemplate(buf,
 				name, nargs, 0, MacroTypeDef,
 				vector<MathData>(), def, display)));
-
-			if (buf && (mode_ & Parse::TRACKMACRO))
-				buf->usermacros.insert(name);
 		}
 		
 		else if (t.cs() == "newcommand" ||
@@ -1108,9 +1105,6 @@ bool Parser::parse1(InsetMathGrid & grid, unsigned flags,
 			cell->push_back(MathAtom(new MathMacroTemplate(buf,
 				name, nargs, optionals, MacroTypeNewcommand,
 				optionalValues, def, display)));
-
-			if (buf && (mode_ & Parse::TRACKMACRO))
-				buf->usermacros.insert(name);
 		}
 		
 		else if (t.cs() == "newcommandx" ||
@@ -1229,9 +1223,6 @@ bool Parser::parse1(InsetMathGrid & grid, unsigned flags,
 			cell->push_back(MathAtom(new MathMacroTemplate(buf,
 				name, nargs, optionals, MacroTypeNewcommandx,
 				optionalValues, def, display)));
-
-			if (buf && (mode_ & Parse::TRACKMACRO))
-				buf->usermacros.insert(name);
 		}
 
 		else if (t.cs() == "(") {
@@ -1830,14 +1821,14 @@ bool Parser::parse1(InsetMathGrid & grid, unsigned flags,
 		}
 
 		else if (t.cs().size()) {
-			bool const no_mhchem =
-				(t.cs() == "ce" || t.cs() == "cf") && buf
-				&& buf->params().use_mhchem == BufferParams::package_off;
-			bool const is_user_macro = no_mhchem ||
-				(buf && (mode_ & Parse::TRACKMACRO
-					? buf->usermacros.count(t.cs()) != 0
-					: buf->getMacro(t.cs(), false) != 0));
 			latexkeys const * l = in_word_set(t.cs());
+
+			if (buf && (mode_ & Parse::TRACKMACRO) && l)
+				buf->updateMacros();
+
+			bool const is_user_macro =
+				(buf && buf->getMacro(t.cs(), false) != 0);
+
 			if (l && !is_user_macro) {
 				if (l->inset == "big") {
 					skipSpaces();