diff --git a/src/add-ons/accelerants/radeon_hd/encoder.cpp b/src/add-ons/accelerants/radeon_hd/encoder.cpp
index df218c48c8..e8447f2733 100644
--- a/src/add-ons/accelerants/radeon_hd/encoder.cpp
+++ b/src/add-ons/accelerants/radeon_hd/encoder.cpp
@@ -1476,6 +1476,10 @@ encoder_dpms_set(uint8 crtcID, int mode)
 			else
 				index = GetIndexIntoMasterTable(COMMAND, DAC2OutputControl);
 			break;
+		default:
+			ERROR("%s: Unknown encoder object! (%" B_PRIu16 ")\n",
+				__func__, encoderID);
+			return;
 	}
 
 	switch (mode) {