diff --git a/src/symbols.js b/src/symbols.js
index 7572aded..8c498fdc 100644
--- a/src/symbols.js
+++ b/src/symbols.js
@@ -563,6 +563,8 @@ defineSymbol(math, main, spacing, null, "\\enspace");
 defineSymbol(math, main, spacing, null, "\\qquad");
 defineSymbol(math, main, spacing, null, "\\quad");
 defineSymbol(math, main, spacing, "\u00a0", "\\space");
+// Ref: LaTeX Source 2e: \DeclareRobustCommand{\nobreakspace}{%
+defineSymbol(math, main, spacing, "\u00a0", "\\nobreakspace");
 defineSymbol(text, main, spacing, null, "\\!");
 defineSymbol(text, main, spacing, "\u00a0", "\\ ");
 defineSymbol(text, main, spacing, "\u00a0", "~");
@@ -573,6 +575,7 @@ defineSymbol(text, main, spacing, null, "\\enspace");
 defineSymbol(text, main, spacing, null, "\\qquad");
 defineSymbol(text, main, spacing, null, "\\quad");
 defineSymbol(text, main, spacing, "\u00a0", "\\space");
+defineSymbol(text, main, spacing, "\u00a0", "\\nobreakspace");
 defineSymbol(math, main, punct, ",", ",");
 defineSymbol(math, main, punct, ";", ";");
 defineSymbol(math, main, punct, ":", "\\colon");
diff --git a/test/katex-spec.js b/test/katex-spec.js
index 384a5e4f..e1d432af 100644
--- a/test/katex-spec.js
+++ b/test/katex-spec.js
@@ -2999,7 +2999,7 @@ describe("Symbols", function() {
     });
 
     it("should parse spacing functions in math or text mode", () => {
-        expect("A\\;B\\,C \\text{A\\;B\\,C}").toParse();
+        expect("A\\;B\\,C\\nobreakspace \\text{A\\;B\\,C\\nobreakspace}").toParse();
     });
 
     it("should render ligature commands like their unicode characters", () => {