diff --git a/src/macros.js b/src/macros.js
index e8c68497..2a64f2d0 100644
--- a/src/macros.js
+++ b/src/macros.js
@@ -334,6 +334,9 @@ defineMacro("\u212D", "\\mathfrak{C}");  // Fraktur
 defineMacro("\u210C", "\\mathfrak{H}");
 defineMacro("\u2128", "\\mathfrak{Z}");
 
+// Define \Bbbk with a macro that works in both HTML and MathML.
+defineMacro("\\Bbbk", "\\Bbb{k}");
+
 // Unicode middle dot
 // The KaTeX fonts do not contain U+00B7. Instead, \cdotp displays
 // the dot at U+22C5 and gives it punct spacing.
diff --git a/src/symbols.js b/src/symbols.js
index f28ab4e4..0b016edf 100644
--- a/src/symbols.js
+++ b/src/symbols.js
@@ -279,7 +279,6 @@ defineSymbol(math, ams, textord, "\u2204", "\\nexists");
 defineSymbol(math, ams, textord, "\u2127", "\\mho");
 defineSymbol(math, ams, textord, "\u2132", "\\Finv", true);
 defineSymbol(math, ams, textord, "\u2141", "\\Game", true);
-defineSymbol(math, ams, textord, "\u006b", "\\Bbbk");
 defineSymbol(math, ams, textord, "\u2035", "\\backprime");
 defineSymbol(math, ams, textord, "\u25b2", "\\blacktriangle");
 defineSymbol(math, ams, textord, "\u25bc", "\\blacktriangledown");