diff --git a/include/cantera/oneD/IonFlow.h b/include/cantera/oneD/IonFlow.h
index 85319fdb2..7ee686056 100644
--- a/include/cantera/oneD/IonFlow.h
+++ b/include/cantera/oneD/IonFlow.h
@@ -82,7 +82,7 @@ protected:
     bool m_import_electron_transport;
 
     //! electrical properties
-    vector_int m_speciesCharge;
+    vector_fp m_speciesCharge;
 
     //! index of species with charges
     std::vector<size_t> m_kCharge;
@@ -98,7 +98,7 @@ protected:
     vector_fp m_mobility;
 
     //! solving stage
-    int m_stage;
+    size_t m_stage;
 
     //! index of electron
     size_t m_kElectron;
diff --git a/include/cantera/transport/IonGasTransport.h b/include/cantera/transport/IonGasTransport.h
index 54513758a..19d711620 100644
--- a/include/cantera/transport/IonGasTransport.h
+++ b/include/cantera/transport/IonGasTransport.h
@@ -81,7 +81,7 @@ protected:
     double omega11_n64(const double tstar, const double gamma);
 
     //! electrical properties
-    vector_int m_speciesCharge;
+    vector_fp m_speciesCharge;
 
     //! index of ions (exclude electron.)
     std::vector<size_t> m_kIon;
diff --git a/src/base/stringUtils.cpp b/src/base/stringUtils.cpp
index 4816b435b..6d4bd166c 100644
--- a/src/base/stringUtils.cpp
+++ b/src/base/stringUtils.cpp
@@ -84,7 +84,7 @@ compositionMap parseCompString(const std::string& ss,
         double value;
         try {
             value = fpValueCheck(ss.substr(valstart, stop-valstart));
-        } catch (CanteraError& err) {
+        } catch (CanteraError&) {
             // If we have a key containing a colon, we expect this to fail. In
             // this case, take the current substring as part of the key and look
             // to the right of the next colon for the corresponding value.
diff --git a/src/clib/ctreactor.cpp b/src/clib/ctreactor.cpp
index de49a4336..7938174e1 100644
--- a/src/clib/ctreactor.cpp
+++ b/src/clib/ctreactor.cpp
@@ -169,7 +169,7 @@ extern "C" {
         try {
             // @todo This should not fail silently
             if (ReactorCabinet::item(i).type() >= ReactorType) {
-                ReactorCabinet::get<Reactor>(i).setChemistry(cflag);
+                ReactorCabinet::get<Reactor>(i).setChemistry(cflag != 0);
             }
             return 0;
         } catch (...) {
diff --git a/src/numerics/IDA_Solver.cpp b/src/numerics/IDA_Solver.cpp
index 5cd54dea6..a5b88101e 100644
--- a/src/numerics/IDA_Solver.cpp
+++ b/src/numerics/IDA_Solver.cpp
@@ -122,7 +122,7 @@ extern "C" {
         } else if (SUNMatGetID(Jac) == SUNMATRIX_BAND) {
             cols = SM_COLS_B(Jac);
         } else {
-            throw Cantera::CanteraError("ida_jacobian", "Unknown SUNMatrix type");
+            return 1; // Unknown SUNMatrix type
         }
         f->evalJacobianDP(t, delta_t, c_j, NV_DATA_S(y), NV_DATA_S(yp),
                           cols, NV_DATA_S(r));
diff --git a/src/zeroD/Reactor.cpp b/src/zeroD/Reactor.cpp
index abb1301b4..50d3b005c 100644
--- a/src/zeroD/Reactor.cpp
+++ b/src/zeroD/Reactor.cpp
@@ -143,7 +143,7 @@ void Reactor::updateState(doublereal* y)
         try {
             TT = bmt::bracket_and_solve_root(
                 u_err, T, 1.2, true, bmt::eps_tolerance<double>(48), maxiter);
-        } catch (std::exception& err) {
+        } catch (std::exception&) {
             // Try full-range bisection if bracketing fails (e.g. near
             // temperature limits for the phase's equation of state)
             try {