diff --git a/dicts/ttcn.dict b/dicts/ttcn.dict
index 0af2e2d..2b4ad38 100644
--- a/dicts/ttcn.dict
+++ b/dicts/ttcn.dict
@@ -86,6 +86,7 @@ lengthof
 log
 map
 match
+decmatch
 message
 mixed
 mod
diff --git a/syntax/ttcn.vim b/syntax/ttcn.vim
index d7f7f0e..d478e79 100644
--- a/syntax/ttcn.vim
+++ b/syntax/ttcn.vim
@@ -80,7 +80,7 @@ syn keyword ttcnAttrib  with display encode extension variant optional
 
 " Operators
 syn keyword ttcnOper    mod rem not and or xor not4b and4b or4b xor4b
-syn keyword ttcnOper    complement pattern match valueof subset superset permutation
+syn keyword ttcnOper    complement pattern match decmatch valueof subset superset permutation
 syn match   ttcnOper    "[-+*/?]"
 syn match   ttcnOper    "[<>]"
 syn match   ttcnError   "="