diff --git a/usrguide/referenceguide/4-ttcn3_language_extensions.adoc b/usrguide/referenceguide/4-ttcn3_language_extensions.adoc
index 76027e6801b7c13dca32492b48ff3dd3a8567a87..101e016f889d6e45975d8d060343198c5605166f 100644
--- a/usrguide/referenceguide/4-ttcn3_language_extensions.adoc
+++ b/usrguide/referenceguide/4-ttcn3_language_extensions.adoc
@@ -1891,7 +1891,7 @@ const INT2 c_i2 := -1
 
 Attribute syntax: `FIELDLENGTH(<parameter>)`
 
-Parameters allowed: `variable`, `null_terminated` (for `charstrin` and universal `charstring` types only) positive integer
+Parameters allowed: `variable`, `null_terminated` (for `charstring` and universal `charstring` types only) positive integer
 
 Default value: `variable`, 8 (for `integer` type only)