diff --git a/MainClass.cs b/MainClass.cs
index 2a75d4f..d3494ec 100644
--- a/MainClass.cs
+++ b/MainClass.cs
@@ -310,7 +310,7 @@ private static void XicParametersParsing(string[] args)
                 }
                 else
                 {
-                    Log.Error("An unexpected error occured:");
+                    Log.Error("An unexpected error occurred:");
                     Log.Error(ex.ToString());
                 }
             }
@@ -473,7 +473,7 @@ private static void SpectrumQueryParametersParsing(string[] args)
                 }
                 else
                 {
-                    Log.Error("An unexpected error occured:");
+                    Log.Error("An unexpected error occurred:");
                     Log.Error(ex.ToString());
                 }
             }
@@ -853,8 +853,8 @@ private static void RegularParametersParsing(string[] args)
             catch (Amazon.S3.AmazonS3Exception ex)
             {
                 Log.Error(!ex.Message.IsNullOrEmpty()
-                    ? "An Amazon S3 exception occured: " + ex.Message
-                    : "An Amazon S3 exception occured: " + ex);
+                    ? "An Amazon S3 exception occurred: " + ex.Message
+                    : "An Amazon S3 exception occurred: " + ex);
             }
             catch (Exception ex)
             {
@@ -864,7 +864,7 @@ private static void RegularParametersParsing(string[] args)
                 }
                 else
                 {
-                    Log.Error("An unexpected error occured:");
+                    Log.Error("An unexpected error occurred:");
                     Log.Error(ex.ToString());
                 }
             }
diff --git a/RawFileParser.cs b/RawFileParser.cs
index f539494..f9ed212 100755
--- a/RawFileParser.cs
+++ b/RawFileParser.cs
@@ -82,7 +82,7 @@ private static void TryProcessFile(ParseInput parseInput)
                 }
                 else
                 {
-                    Log.Error("An unexpected error occured (see below)");
+                    Log.Error("An unexpected error occurred (see below)");
                     Log.Error(ex.ToString());
                     parseInput.NewError();
                 }