diff --git a/maca_trans_parser/src/simple_decoder_parser_arc_eager.c b/maca_trans_parser/src/simple_decoder_parser_arc_eager.c
index 417dc9ba8cab229855292bad058c5cb07efe25fb..dc53362822b9d131a1d35035c108439d3db51534 100644
--- a/maca_trans_parser/src/simple_decoder_parser_arc_eager.c
+++ b/maca_trans_parser/src/simple_decoder_parser_arc_eager.c
@@ -4,6 +4,7 @@
 #include<unistd.h>
 #include<getopt.h>
 #include"context.h"
+#include<math.h>
 #include"movement_parser_arc_eager.h"
 #include"feat_fct.h"
 #include"config2feat_vec.h"