diff --git a/milkymist/asmicon/bankmachine.py b/milkymist/asmicon/bankmachine.py
index 8b1740811..de472919a 100644
--- a/milkymist/asmicon/bankmachine.py
+++ b/milkymist/asmicon/bankmachine.py
@@ -79,7 +79,7 @@ class _SimpleSelector(_Selector):
 				(slot.state == SLOT_PENDING)
 			))
 	
-		return Fragment(comb) + super().get_fragment()
+		return Fragment(comb) + _Selector.get_fragment(self)
 
 class _FullSelector(_Selector):
 	def get_fragment(self):
@@ -149,7 +149,7 @@ class _FullSelector(_Selector):
 			select_stmt = If(has_mature, *best_mature).Else(select_stmt)
 		comb.append(select_stmt)
 		
-		return Fragment(comb, sync) + super().get_fragment()
+		return Fragment(comb, sync) + _Selector.get_fragment(self)
 
 class _Buffer:
 	def __init__(self, source):
diff --git a/milkymist/framebuffer/__init__.py b/milkymist/framebuffer/__init__.py
index d5373b261..d0dea5fa6 100644
--- a/milkymist/framebuffer/__init__.py
+++ b/milkymist/framebuffer/__init__.py
@@ -44,11 +44,11 @@ class _FrameInitiator(spi.SingleGenerator):
 			("base", asmi_bits, 0, alignment_bits),
 			("length", length_bits, 640*480*4, alignment_bits)
 		]
-		super().__init__(layout, spi.MODE_CONTINUOUS)
+		spi.SingleGenerator.__init__(self, layout, spi.MODE_CONTINUOUS)
 
 class VTG(Actor):
 	def __init__(self):
-		super().__init__(
+		Actor.__init__(self,
 			("timing", Sink, [
 				("hres", _hbits),
 				("hsync_start", _hbits),
@@ -115,7 +115,7 @@ class VTG(Actor):
 
 class FIFO(Actor):
 	def __init__(self):
-		super().__init__(("dac", Sink, _dac_layout))
+		Actor.__init__(self, ("dac", Sink, _dac_layout))
 		
 		self.vga_hsync_n = Signal()
 		self.vga_vsync_n = Signal()