diff --git a/src/math/mathalias.pysty b/src/math/mathalias.pysty
index fbb1fcd..bf9d00f 100644
--- a/src/math/mathalias.pysty
+++ b/src/math/mathalias.pysty
@@ -40,4 +40,5 @@ __IF__(basic)
 __IF__(extended)
     \expandafter\makealiasesforwith\expandafter\mathcal\expandafter{\expandafter c\expandafter}\expandafter{__PACKAGE_MACRO__(all)}
     \expandafter\makealiasesforwith\expandafter\mathfrak\expandafter{\expandafter f\expandafter}\expandafter{__PACKAGE_MACRO__(all)}
+    \expandafter\makealiasesforwith\expandafter\mathbb\expandafter{\expandafter b\expandafter}\expandafter{__PACKAGE_MACRO__(all)}
 \fi