diff --git a/hamming.c b/hamming.c
index 3340a12..c6d5525 100644
--- a/hamming.c
+++ b/hamming.c
@@ -176,8 +176,7 @@ hamming_text(PG_FUNCTION_ARGS)
 	elog(DEBUG1, "is normalized: %d", pgs_hamming_is_normalized);
 	elog(DEBUG1, "maximum length: %d", maxlen);
 
-	elog(DEBUG1, "hammingdistance(%s, %s) = %.3f", DatumGetCString(a),
-		 DatumGetCString(b), res);
+	elog(DEBUG1, "hammingdistance(%s, %s) = %.3f", a, b, res);
 
 	/* if one string has zero length then return one */
 	if (maxlen == 0)
@@ -185,8 +184,7 @@ hamming_text(PG_FUNCTION_ARGS)
 	else if (pgs_hamming_is_normalized)
 	{
 		res = 1.0 - (res / maxlen);
-		elog(DEBUG1, "hamming(%s, %s) = %.3f", DatumGetCString(a), DatumGetCString(b),
-			 res);
+		elog(DEBUG1, "hamming(%s, %s) = %.3f", a, b, res);
 		PG_RETURN_FLOAT8(res);
 	}
 	else