diff --git a/compiler/heptagon/parsing/hept_parser.mly b/compiler/heptagon/parsing/hept_parser.mly
index d726cd7..12fd71c 100644
--- a/compiler/heptagon/parsing/hept_parser.mly
+++ b/compiler/heptagon/parsing/hept_parser.mly
@@ -166,9 +166,12 @@ label_ty:
   IDENT COLON ty_ident { $1, $3 }
 ;
 
+returns: RETURNS | EQUAL {}
+;
+
 node_dec:
   | n=node_or_fun f=ident pc=node_params LPAREN i=in_params RPAREN
-    RETURNS LPAREN o=out_params RPAREN
+    returns LPAREN o=out_params RPAREN
     c=contract b=block(LET) TEL
       {{ n_name = f;
          n_stateful = n;
@@ -656,7 +659,7 @@ interface_desc:
   | type_dec         { Itypedef $1 }
   | const_dec        { Iconstdef $1 }
   | VAL n=node_or_fun f=ident pc=node_params LPAREN i=params_signature RPAREN
-    RETURNS LPAREN o=params_signature RPAREN
+    returns LPAREN o=params_signature RPAREN
     { Isignature({ sig_name = f;
                    sig_inputs = i;
                    sig_stateful = n;