diff --git a/python/sdist/amici/cxxcodeprinter.py b/python/sdist/amici/cxxcodeprinter.py
index adc4c25454..fb98b0aca0 100644
--- a/python/sdist/amici/cxxcodeprinter.py
+++ b/python/sdist/amici/cxxcodeprinter.py
@@ -339,7 +339,7 @@ def csc_matrix(
     for col in range(ncols):
         symbol_col_ptrs.append(idx)
         for row in range(nrows):
-            if matrix[row, col] == 0:
+            if matrix[row, col].is_zero:
                 continue
 
             symbol_row_vals.append(row)
diff --git a/python/sdist/amici/de_model.py b/python/sdist/amici/de_model.py
index b69cc6ba68..ea2807df52 100644
--- a/python/sdist/amici/de_model.py
+++ b/python/sdist/amici/de_model.py
@@ -2115,7 +2115,7 @@ def state_is_constant(self, ix: int) -> bool:
         if isinstance(state, AlgebraicState):
             return False
 
-        return state.get_dt() == 0.0
+        return state.get_dt().is_zero
 
     def conservation_law_has_multispecies(self, tcl: ConservationLaw) -> bool:
         """
@@ -2179,7 +2179,7 @@ def _get_unique_root(
             return None
 
         for root in roots:
-            if sp.simplify(root_found - root.get_val()) == 0:
+            if sp.simplify(root_found - root.get_val()).is_zero:
                 return root.get_id()
 
         # create an event for a new root function