diff --git a/os/devicetree/redpitaya_puzzlefw.dts b/os/devicetree/redpitaya_puzzlefw.dts
index 93e400f..2613d67 100644
--- a/os/devicetree/redpitaya_puzzlefw.dts
+++ b/os/devicetree/redpitaya_puzzlefw.dts
@@ -77,10 +77,10 @@
 		//
 		// Register address mapping:
 		//
-		// Address 0x43000000 .. 0x430fffff (1 MB) = user registers
+		// Address 0x43000000 .. 0x43000fff (4 kB) = user registers
 		// Address 0x43100000 .. 0x43100fff (4 kB) = setup registers
 		//
-		reg = <0x43000000 0x100000>,
+		reg = <0x43000000 0x1000>,
 		      <0x43100000 0x1000>;
 
 		//