diff --git a/src/NSwag.CodeGeneration/OperationNameGenerators/MultipleClientsFromPathSegmentsOperationNameGenerator.cs b/src/NSwag.CodeGeneration/OperationNameGenerators/MultipleClientsFromPathSegmentsOperationNameGenerator.cs
index eac4d298df..a7478e60a9 100644
--- a/src/NSwag.CodeGeneration/OperationNameGenerators/MultipleClientsFromPathSegmentsOperationNameGenerator.cs
+++ b/src/NSwag.CodeGeneration/OperationNameGenerators/MultipleClientsFromPathSegmentsOperationNameGenerator.cs
@@ -80,8 +80,8 @@ internal static string CapitalizeFirst(string name)
                 return string.Empty;
             }
 
-            var capitalized = name.ToLower();
-            return char.ToUpper(capitalized[0]) + (capitalized.Length > 1 ? capitalized.Substring(1) : "");
+            var capitalized = name.ToLowerInvariant();
+            return char.ToUpperInvariant(capitalized[0]) + (capitalized.Length > 1 ? capitalized.Substring(1) : "");
         }
     }
 }
\ No newline at end of file
diff --git a/src/NSwag.CodeGeneration/OperationNameGenerators/SingleClientFromPathSegmentsOperationNameGenerator.cs b/src/NSwag.CodeGeneration/OperationNameGenerators/SingleClientFromPathSegmentsOperationNameGenerator.cs
index 1081477ee8..648cf3f8be 100644
--- a/src/NSwag.CodeGeneration/OperationNameGenerators/SingleClientFromPathSegmentsOperationNameGenerator.cs
+++ b/src/NSwag.CodeGeneration/OperationNameGenerators/SingleClientFromPathSegmentsOperationNameGenerator.cs
@@ -81,8 +81,8 @@ internal static string CapitalizeFirst(string name)
                 return string.Empty;
             }
 
-            var capitalized = name.ToLower();
-            return char.ToUpper(capitalized[0]) + (capitalized.Length > 1 ? capitalized.Substring(1) : "");
+            var capitalized = name.ToLowerInvariant();
+            return char.ToUpperInvariant(capitalized[0]) + (capitalized.Length > 1 ? capitalized.Substring(1) : "");
         }
     }
 }
\ No newline at end of file