diff --git a/src/odata.pegjs b/src/odata.pegjs
index af60680..ebfeb8e 100644
--- a/src/odata.pegjs
+++ b/src/odata.pegjs
@@ -285,7 +285,7 @@ filterExpr                  =
                                 return filterExprHelper(left, right);
                               }
 
-booleanFunctions2Args       = "substringof" / "endswith" / "startswith" / "IsOf"
+booleanFunctions2Args       = "substringof" / "endswith" / "startswith" / "IsOf" / "contains"
 
 booleanFunc                 =  f:booleanFunctions2Args "(" arg0:part "," WSP? arg1:part ")" {
                                     return {