diff --git a/sys/dev/en/midway.c b/sys/dev/en/midway.c
index 18813e7af901..a2aed43e0a1f 100644
--- a/sys/dev/en/midway.c
+++ b/sys/dev/en/midway.c
@@ -344,6 +344,7 @@ en_k2sz(int k)
 }
 #define en_log2(X) en_k2sz(X)
 
+#if 0
 /*
  * en_b2sz: convert a DMA burst code to its byte size
  */
@@ -365,6 +366,7 @@ en_b2sz(int b)
 	}
 	return (0);
 }
+#endif
 
 /*
  * en_sz2b: convert a burst size (bytes) to DMA burst code