diff --git a/openmc/settings.py b/openmc/settings.py
index ead2c0d002..17c24ba81e 100644
--- a/openmc/settings.py
+++ b/openmc/settings.py
@@ -1174,7 +1174,6 @@ class Settings:
                             raise ValueError(
                                 f'Invalid domain type: {type(domain)}. Expected '
                                 'openmc.Material, openmc.Cell, or openmc.Universe.')
-                cv.check_type('adjoint', value, bool)
             elif key == 'sample_method':
                 cv.check_value('sample method', value,
                                ('prng', 'halton'))
diff --git a/src/scattdata.cpp b/src/scattdata.cpp
index 813f9e19b5..21b18cbd92 100644
--- a/src/scattdata.cpp
+++ b/src/scattdata.cpp
@@ -37,22 +37,12 @@ void ScattData::base_init(int order, const xt::xtensor<int, 1>& in_gmin,
     mult[gin] = in_mult[gin];
 
     // Make sure the multiplicity does not have 0s
-    unsigned long int num_converted = 0;
     for (int go = 0; go < mult[gin].size(); go++) {
       if (mult[gin][go] == 0.) {
-        num_converted += 1;
         mult[gin][go] = 1.;
       }
     }
 
-    if (num_converted > 0) {
-      // Raise a warning to the user if we did have to do the conversion
-      std::string msg =
-        std::to_string(num_converted) +
-        " entries in the Multiplicity Matrix were changed from 0 to 1";
-      warning(msg);
-    }
-
     // Make sure the energy is normalized
     double norm = std::accumulate(energy[gin].begin(), energy[gin].end(), 0.);