diff --git a/pmd-matlab/etc/grammar/matlab.jj b/pmd-matlab/etc/grammar/matlab.jj
index 6f61dd0d42..0e1029a203 100644
--- a/pmd-matlab/etc/grammar/matlab.jj
+++ b/pmd-matlab/etc/grammar/matlab.jj
@@ -65,6 +65,7 @@ SPECIAL_TOKEN:
 |   < AT: "@" > : DEFAULT
 |   < DOT: "." > : TRANSPOSE
 |   < COMMA: "," > : DEFAULT
+|   < QUESTIONMARK: "?" > : DEFAULT
 }
 
 <DEFAULT, TRANSPOSE> TOKEN : /* OPERATORS AND ASSIGNMENTS */