diff --git a/ir_RC5_RC6.cpp b/ir_RC5_RC6.cpp
index e59e3c0..10e7927 100644
--- a/ir_RC5_RC6.cpp
+++ b/ir_RC5_RC6.cpp
@@ -10,6 +10,7 @@
 // t1 is the time interval for a single bit in microseconds.
 // Returns -1 for error (measured time interval is not a multiple of t1).
 //
+#if (DECODE_RC5 || DECODE_RC6)
 int  IRrecv::getRClevel (decode_results *results,  int *offset,  int *used,  int t1)
 {
 	int  width;
@@ -37,6 +38,7 @@ int  IRrecv::getRClevel (decode_results *results,  int *offset,  int *used,  int
 
 	return val;
 }
+#endif
 
 //==============================================================================
 // RRRR    CCCC  55555