diff --git a/rmgpy/kinetics/arrhenius.pyx b/rmgpy/kinetics/arrhenius.pyx
index 748d0eb6b95..94f7cf2846b 100644
--- a/rmgpy/kinetics/arrhenius.pyx
+++ b/rmgpy/kinetics/arrhenius.pyx
@@ -666,7 +666,7 @@ cdef class ArrheniusBM(KineticsModel):
             keep_trying = True
             xtol = 1e-8
             ftol = 1e-8
-            while boo:
+            while keep_trying:
                 keep_trying = False
                 try:
                     params = curve_fit(kfcn, xdata, ydata, sigma=sigmas, p0=[1.0, 1.0, w0 / 10.0], xtol=xtol, ftol=ftol)