diff --git a/coffea/lookup_tools/doublecrystalball.py b/coffea/lookup_tools/doublecrystalball.py
index 2f6964bec..fe8f5921e 100644
--- a/coffea/lookup_tools/doublecrystalball.py
+++ b/coffea/lookup_tools/doublecrystalball.py
@@ -204,7 +204,7 @@ def _argcheck(self, betaL, betaH, mL, mH):
         """
         Shape parameter bounds are m > 1 and beta > 0.
         """
-        return (mL > 1) & (betaL > 0) & (mH > 1) & (betaH > 1)
+        return (mL > 1) & (betaL > 0) & (mH > 1) & (betaH > 0)
 
 
 doublecrystalball = doublecrystalball_gen(