diff --git a/src/libraries/System.Reflection.Emit/tests/PersistableAssemblyBuilder/AssemblySaveILGeneratorTests.cs b/src/libraries/System.Reflection.Emit/tests/PersistableAssemblyBuilder/AssemblySaveILGeneratorTests.cs
index afa42d5f0588b..f11c899eb3040 100644
--- a/src/libraries/System.Reflection.Emit/tests/PersistableAssemblyBuilder/AssemblySaveILGeneratorTests.cs
+++ b/src/libraries/System.Reflection.Emit/tests/PersistableAssemblyBuilder/AssemblySaveILGeneratorTests.cs
@@ -442,7 +442,7 @@ public void LocalBuilderMultipleLocalsUsage()
                 Assert.Equal((byte)OpCodes.Ldloc_2.Value, bodyBytes[24]);
                 Assert.Equal(0xFE, bodyBytes[25]); // Ldloc = 0xfe0c
                 Assert.Equal(0x0C, bodyBytes[26]);
-                Assert.Equal(0, BitConverter.ToInt32(bodyBytes.AsSpan().Slice(27, 4))); // index 0 of 'il.Emit(OpCodes.Ldloc, 0);' instruction
+                Assert.Equal(0, BinaryPrimitives.ReadInt32LittleEndian(bodyBytes.AsSpan().Slice(27, 4))); // index 0 of 'il.Emit(OpCodes.Ldloc, 0);' instruction
                 Assert.Equal((byte)OpCodes.Add.Value, bodyBytes[31]);
                 Assert.Equal((byte)OpCodes.Stloc_0.Value, bodyBytes[32]);
                 Assert.Equal((byte)OpCodes.Ldloca_S.Value, bodyBytes[33]);
@@ -650,13 +650,13 @@ void Main(int a)
                 int intTypeToken = BinaryPrimitives.ReadInt32LittleEndian(bodyBytes.AsSpan().Slice(22, 4));
                 Assert.Equal(OpCodes.Ldarg_1.Value, bodyBytes[26]);
                 Assert.Equal(OpCodes.Box.Value, bodyBytes[27]);
-                Assert.Equal(intTypeToken, BitConverter.ToInt32(bodyBytes.AsSpan().Slice(28, 4)));
+                Assert.Equal(intTypeToken, BinaryPrimitives.ReadInt32LittleEndian(bodyBytes.AsSpan().Slice(28, 4)));
                 Assert.Equal(OpCodes.Ldarg_0.Value, bodyBytes[32]);
                 Assert.Equal(OpCodes.Ldarg_1.Value, bodyBytes[33]);
                 Assert.Equal(OpCodes.Call.Value, bodyBytes[34]);
                 Assert.Equal(methodMultiply.MetadataToken, BinaryPrimitives.ReadInt32LittleEndian(bodyBytes.AsSpan().Slice(35, 4)));
                 Assert.Equal(OpCodes.Box.Value, bodyBytes[39]);
-                Assert.Equal(intTypeToken, BitConverter.ToInt32(bodyBytes.AsSpan().Slice(40, 4)));
+                Assert.Equal(intTypeToken, BinaryPrimitives.ReadInt32LittleEndian(bodyBytes.AsSpan().Slice(40, 4)));
                 Assert.Equal(OpCodes.Call.Value, bodyBytes[44]);
                 // Bytes 24, 46, 47, 48 are token for writeLineObj, but it is not same as the value before save
                 Assert.Equal(OpCodes.Ret.Value, bodyBytes[49]);