diff --git a/fx92/drawing.py b/fx92/drawing.py
index 904a314..7048a04 100644
--- a/fx92/drawing.py
+++ b/fx92/drawing.py
@@ -199,7 +199,7 @@ class Window:
         """Push window contents on-screen."""
 
         if self.stream:
-            name = "{:04d}.png".format(self.streamid)
+            name = "{:04d}.bmp".format(self.streamid)
             self.save(os.path.join(self.stream, name))
             self.streamid += 1
 
diff --git a/fx92/parser.py b/fx92/parser.py
index aa91cff..178a4a6 100644
--- a/fx92/parser.py
+++ b/fx92/parser.py
@@ -249,7 +249,7 @@ class Parser:
             e = self.expr()
 
             # Allow a parenthesis to be removed at the end of a parameter
-            optional = (self.la.type == T.PARAM)
+            optional = (self.la.type in [T.PARAM, T.SEMI])
             self.expect(T.RPAR, optional=optional)
             return Node(N.EXP, a, e)
 
@@ -270,7 +270,7 @@ class Parser:
             e = self.expr()
 
             # Allow a parenthesis to be removed at the end of a parameter
-            optional = (self.la.type == T.PARAM)
+            optional = (self.la.type in [T.PARAM, T.SEMI])
             self.expect(T.RPAR, optional=optional)
             return e
 
@@ -279,7 +279,7 @@ class Parser:
             a = self.funargs()
 
             # Allow a parenthesis to be removed at the end of a parameter
-            optional = (self.la.type == T.PARAM)
+            optional = (self.la.type in [T.PARAM, T.SEMI])
             self.expect(T.RPAR, optional=optional)
 
             return Node(N.FUN, name, a)