diff --git a/mex/sources/libslicot/AB13ED.f b/mex/sources/libslicot/AB13ED.f
index 32033b739262f64d36b2fa609a9ebeab52e91ca1..a757b84e2234d1ff9fe1dcf76d59b0c640c1273c 100644
--- a/mex/sources/libslicot/AB13ED.f
+++ b/mex/sources/libslicot/AB13ED.f
@@ -229,7 +229,7 @@ C
 C
       SUFWRK = LDWORK-IWK.GE.N2
 C
-C     Computation of the tolerances and the treshold for termination of
+C     Computation of the tolerances and the threshold for termination of
 C     the bisection method. SEPS is the square root of the machine
 C     precision.
 C