diff --git a/src/Mod/Fem/femtools/constants.py b/src/Mod/Fem/femtools/constants.py
index 520233c0e4..33f1500a89 100644
--- a/src/Mod/Fem/femtools/constants.py
+++ b/src/Mod/Fem/femtools/constants.py
@@ -38,7 +38,7 @@ def gravity():
 
 
 def stefan_boltzmann():
-    # https://en.wikipedia.org/wiki/Stefan–Boltzmann_constant
+    # https://en.wikipedia.org/wiki/Stefan-Boltzmann_constant
     return "5.67037e-8 W/(m^2*K^4)"