diff --git a/csharp/src/Google.Protobuf/InvalidProtocolBufferException.cs b/csharp/src/Google.Protobuf/InvalidProtocolBufferException.cs
index eeb0f13..0fbc530 100644
--- a/csharp/src/Google.Protobuf/InvalidProtocolBufferException.cs
+++ b/csharp/src/Google.Protobuf/InvalidProtocolBufferException.cs
@@ -61,7 +61,7 @@
         {
             return new InvalidProtocolBufferException(
                 "While parsing a protocol message, the input ended unexpectedly " +
-                "in the middle of a field.  This could mean either than the " +
+                "in the middle of a field.  This could mean either that the " +
                 "input has been truncated or that an embedded message " +
                 "misreported its own length.");
         }