diff --git a/src/macros.js b/src/macros.js
index d79b9b1e..c331daad 100644
--- a/src/macros.js
+++ b/src/macros.js
@@ -223,6 +223,17 @@ defineMacro("\\llap", "\\mathllap{\\textrm{#1}}");
 defineMacro("\\rlap", "\\mathrlap{\\textrm{#1}}");
 defineMacro("\\clap", "\\mathclap{\\textrm{#1}}");
 
+// Negated symbols from base/fontmath.ltx:
+// \def\neq{\not=} \let\ne=\neq
+// \DeclareRobustCommand
+//   \notin{\mathrel{\m@th\mathpalette\c@ncel\in}}
+// \def\c@ncel#1#2{\m@th\ooalign{$\hfil#1\mkern1mu/\hfil$\crcr$#1#2$}}
+defineMacro("\\neq", "\\not=");
+defineMacro("\\ne", "\\neq");
+defineMacro("\u2260", "\\neq");
+defineMacro("\\notin", "\\mathrel{{\\in}\\mathllap{/\\mskip1mu}}");
+defineMacro("\u2209", "\\notin");
+
 // Unicode stacked relations
 defineMacro("\u2258",
     "\\mathrel{=\\kern{-1em}\\raisebox{0.4em}{$\\scriptsize\\frown$}}");
diff --git a/src/symbols.js b/src/symbols.js
index cac8db0a..c8bb9581 100644
--- a/src/symbols.js
+++ b/src/symbols.js
@@ -552,7 +552,6 @@ defineSymbol(math, main, rel, "\u2265", "\\geq", true);
 defineSymbol(math, main, rel, "\u2190", "\\gets");
 defineSymbol(math, main, rel, ">", "\\gt");
 defineSymbol(math, main, rel, "\u2208", "\\in", true);
-defineSymbol(math, main, rel, "\u2209", "\\notin", true);
 defineSymbol(math, main, rel, "\u0338", "\\not");
 defineSymbol(math, main, rel, "\u2282", "\\subset", true);
 defineSymbol(math, main, rel, "\u2283", "\\supset", true);
@@ -565,8 +564,6 @@ defineSymbol(math, main, rel, "\u2190", "\\leftarrow", true);
 defineSymbol(math, main, rel, "\u2264", "\\le");
 defineSymbol(math, main, rel, "\u2264", "\\leq", true);
 defineSymbol(math, main, rel, "<", "\\lt");
-defineSymbol(math, main, rel, "\u2260", "\\ne", true);
-defineSymbol(math, main, rel, "\u2260", "\\neq");
 defineSymbol(math, main, rel, "\u2192", "\\rightarrow", true);
 defineSymbol(math, main, rel, "\u2192", "\\to");
 defineSymbol(math, ams, rel, "\u2271", "\\ngeq", true);
diff --git a/test/katex-spec.js b/test/katex-spec.js
index 07c9acb9..a849e9f0 100644
--- a/test/katex-spec.js
+++ b/test/katex-spec.js
@@ -1404,13 +1404,12 @@ describe("A font parser", function() {
         expect(nestedParse.value.font).toEqual("mathbb");
         expect(nestedParse.value.type).toEqual("font");
 
-        expect(nestedParse.value.body.value.length).toEqual(3);
+        expect(nestedParse.value.body.value.length).toEqual(4);
         const bbBody = nestedParse.value.body.value;
         expect(bbBody[0].type).toEqual("mathord");
-        expect(bbBody[1].type).toEqual("rel");
-        expect(bbBody[2].type).toEqual("font");
-        expect(bbBody[2].value.font).toEqual("mathrm");
-        expect(bbBody[2].value.type).toEqual("font");
+        expect(bbBody[3].type).toEqual("font");
+        expect(bbBody[3].value.font).toEqual("mathrm");
+        expect(bbBody[3].value.type).toEqual("font");
     });
 
     it("should work with \\textcolor", function() {
diff --git a/test/screenshotter/images/Not-chrome.png b/test/screenshotter/images/Not-chrome.png
index df3d0d41..9b587107 100644
Binary files a/test/screenshotter/images/Not-chrome.png and b/test/screenshotter/images/Not-chrome.png differ
diff --git a/test/screenshotter/images/Not-firefox.png b/test/screenshotter/images/Not-firefox.png
index 1460d504..9a639c75 100644
Binary files a/test/screenshotter/images/Not-firefox.png and b/test/screenshotter/images/Not-firefox.png differ
diff --git a/test/screenshotter/ss_data.yaml b/test/screenshotter/ss_data.yaml
index 01dcb8fa..7b83c2bf 100644
--- a/test/screenshotter/ss_data.yaml
+++ b/test/screenshotter/ss_data.yaml
@@ -224,7 +224,8 @@ NewLine: |
 Not: |
     \begin{array}{l}
         \not=\not>\not\geq\not\in\not<\not\leq\not{abc} \\
-        \not xy + ab \not xy
+        \not xy + ab \not xy \\
+        a \neq b \notin c
     \end{array}
 NullDelimiterInteraction: a \bigl. + 2 \quad \left. + a \right)
 OldFont: |