diff --git a/src/pkgdefaults.jl b/src/pkgdefaults.jl
index fbcd9900..d264852a 100644
--- a/src/pkgdefaults.jl
+++ b/src/pkgdefaults.jl
@@ -123,7 +123,7 @@ const Φ0 = h/(2q)                   # Superconducting magnetic flux quantum
 const me = 9.109_383_56e-31*kg      # (11) electron rest mass
 const mn = 1.674_927_471e-27*kg     # (21) neutron rest mass
 const mp = 1.672_621_898e-27*kg     # (21) proton rest mass
-const μB = e*ħ/(2*me)               # Bohr magneton
+const μB = q*ħ/(2*me)               # Bohr magneton
 const µB = μB
 const Na = 6.022_140_857e23/mol     # (74) Avogadro constant
 const R  = 8.314_459_8*J/(mol*K)    # (48) molar gass constant