diff --git a/src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/PgoInfoKey.cs b/src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/PgoInfoKey.cs
index 01405217d8d46..e25f3779d9b2d 100644
--- a/src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/PgoInfoKey.cs
+++ b/src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/PgoInfoKey.cs
@@ -111,7 +111,7 @@ public PgoInfoKey(IAssemblyMetadata componentReader, string owningType, EntityHa
                 {
                     sb.Append(", ");
                 }
-                sb.AppendFormat($"{Signature.ParameterTypes[i]}");
+                sb.Append($"{Signature.ParameterTypes[i]}");
             }
             sb.Append(")");
 
@@ -135,4 +135,4 @@ public static PgoInfoKey FromReadyToRunMethod(ReadyToRunMethod method)
             return key;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/ReadyToRunMethod.cs b/src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/ReadyToRunMethod.cs
index 9032ef2742179..e1a8b87a764c6 100644
--- a/src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/ReadyToRunMethod.cs
+++ b/src/coreclr/tools/aot/ILCompiler.Reflection.ReadyToRun/ReadyToRunMethod.cs
@@ -465,7 +465,7 @@ public ReadyToRunMethod(
                 {
                     sb.Append(", ");
                 }
-                sb.AppendFormat($"{Signature.ParameterTypes[i]}");
+                sb.Append($"{Signature.ParameterTypes[i]}");
             }
             sb.Append(")");