diff --git a/tree/dataframe/src/RNTupleDS.cxx b/tree/dataframe/src/RNTupleDS.cxx
index 8458036bfdd0c..0afb7dcefe10e 100644
--- a/tree/dataframe/src/RNTupleDS.cxx
+++ b/tree/dataframe/src/RNTupleDS.cxx
@@ -100,7 +100,7 @@ class RRDFCardinalityField final : public RRDFCardinalityFieldBase {
    {
       if constexpr (std::is_same_v<T, bool> || std::is_same_v<T, std::uint64_t>)
          return;
-      if (size > std::numeric_limits<T>::max()) {
+      if (size > static_cast<ROOT::NTupleSize_t>(std::numeric_limits<T>::max())) {
          throw RException(R__FAIL(std::string("integer overflow in field ") + GetFieldName() +
                                   ". Please read the column with a larger-sized integral type."));
       }
diff --git a/tree/dataframe/test/dataframe_hist.cxx b/tree/dataframe/test/dataframe_hist.cxx
index 2d084785df2d9..f5fe396b50de3 100644
--- a/tree/dataframe/test/dataframe_hist.cxx
+++ b/tree/dataframe/test/dataframe_hist.cxx
@@ -265,7 +265,7 @@ TEST_P(RDFHist, InvalidNumberOfArguments)
       // Cannot use EXPECT_THROW because of template arguments...
       dfX.Hist</*BinContentType=*/double, double, double>({axis}, {"x", "x"});
       FAIL() << "expected std::invalid_argument";
-   } catch (const std::invalid_argument &e) {
+   } catch (const std::invalid_argument &) {
       // expected
    }
 
@@ -274,7 +274,7 @@ TEST_P(RDFHist, InvalidNumberOfArguments)
       // Cannot use EXPECT_THROW because of template arguments...
       dfX.Hist<double, double>(hist, {"x", "x"});
       FAIL() << "expected std::invalid_argument";
-   } catch (const std::invalid_argument &e) {
+   } catch (const std::invalid_argument &) {
       // expected
    }
 
@@ -283,7 +283,7 @@ TEST_P(RDFHist, InvalidNumberOfArguments)
       // Cannot use EXPECT_THROW because of template arguments...
       dfX.Hist<double, double>(engine, {"x", "x"});
       FAIL() << "expected std::invalid_argument";
-   } catch (const std::invalid_argument &e) {
+   } catch (const std::invalid_argument &) {
       // expected
    }
 }
@@ -417,7 +417,7 @@ TEST_P(RDFHist, WeightInvalidNumberOfArguments)
       // Cannot use EXPECT_THROW because of template arguments...
       dfXW.Hist</*BinContentType=*/double, double, double, double>({axis}, {"x", "x"}, "w");
       FAIL() << "expected std::invalid_argument";
-   } catch (const std::invalid_argument &e) {
+   } catch (const std::invalid_argument &) {
       // expected
    }
 
@@ -426,7 +426,7 @@ TEST_P(RDFHist, WeightInvalidNumberOfArguments)
       // Cannot use EXPECT_THROW because of template arguments...
       dfXW.Hist<double, double, double>(hist, {"x", "x"}, "w");
       FAIL() << "expected std::invalid_argument";
-   } catch (const std::invalid_argument &e) {
+   } catch (const std::invalid_argument &) {
       // expected
    }
 
@@ -435,7 +435,7 @@ TEST_P(RDFHist, WeightInvalidNumberOfArguments)
       // Cannot use EXPECT_THROW because of template arguments...
       dfXW.Hist<double, double, double>(engine, {"x", "x"}, "w");
       FAIL() << "expected std::invalid_argument";
-   } catch (const std::invalid_argument &e) {
+   } catch (const std::invalid_argument &) {
       // expected
    }
 }
diff --git a/tree/ntuple/test/ntuple_soa.cxx b/tree/ntuple/test/ntuple_soa.cxx
index 889da7daeb8b8..f32c17c6d4a31 100644
--- a/tree/ntuple/test/ntuple_soa.cxx
+++ b/tree/ntuple/test/ntuple_soa.cxx
@@ -71,7 +71,9 @@ TEST(RNTuple, SoACheck)
    } catch (const ROOT::RException &e) {
       EXPECT_THAT(e.what(), ::testing::HasSubstr("SoA fields with inheritance are currently unsupported"));
    }
-   EXPECT_NO_THROW(std::make_unique<RSoAField>("f", "SoABase"));
+   {
+      EXPECT_NO_THROW(auto f = std::make_unique<RSoAField>("f", "SoABase"));
+   }
 
    try {
       auto f = std::make_unique<RSoAField>("f", "SoASimpleBadArray");
@@ -104,7 +106,9 @@ TEST(RNTuple, SoACheck)
       EXPECT_THAT(e.what(), ::testing::HasSubstr("SoA member type mismatch: fY (double [Double32_t] vs. float)"));
    }
 
-   EXPECT_NO_THROW(std::make_unique<RSoAField>("f", "SoASimple"));
+   {
+      EXPECT_NO_THROW(auto f = std::make_unique<RSoAField>("f", "SoASimple"));
+   }
 
    try {
       auto f = std::make_unique<ROOT::RField<SoA>>("f");