diff --git a/syntax/eo.vim b/syntax/eo.vim
index bb4cb34..8d8f493 100644
--- a/syntax/eo.vim
+++ b/syntax/eo.vim
@@ -14,7 +14,7 @@ syn keyword    eoStructure struct enum var
 syn keyword    eoTypedef type
 syn keyword    eoImport import
 
-syn keyword    eoClassBodyLabels legacy_prefix eo_prefix data contained
+syn keyword    eoClassBodyLabels legacy_prefix eo_prefix event_prefix data contained
 syn keyword    eoClassBodyBlockOpener properties methods events constructors implements contained
 
 syn keyword    eoInnerBlockOpener set get keys values params contained