diff --git a/lib/dns/master.c b/lib/dns/master.c
index 8c6541dfd7..80450f0fd7 100644
--- a/lib/dns/master.c
+++ b/lib/dns/master.c
@@ -569,6 +569,10 @@ loadctx_create(dns_masterformat_t format, isc_mem_t *mctx,
 		if (result != ISC_R_SUCCESS)
 			goto cleanup_inc;
 		lctx->keep_lex = false;
+		/*
+		 * If specials change update dns_test_rdatafromstring()
+		 * in lib/dns/tests/dnstest.c.
+		 */
 		memset(specials, 0, sizeof(specials));
 		specials[0] = 1;
 		specials['('] = 1;
diff --git a/lib/dns/tests/dnstest.c b/lib/dns/tests/dnstest.c
index d6316395cd..dcaed95745 100644
--- a/lib/dns/tests/dnstest.c
+++ b/lib/dns/tests/dnstest.c
@@ -481,6 +481,7 @@ dns_test_rdatafromstring(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
 	dns_rdatacallbacks_t callbacks;
 	isc_buffer_t source, target;
 	isc_lex_t *lex = NULL;
+	isc_lexspecials_t specials = { 0 };
 	isc_result_t result;
 	size_t length;
 
@@ -504,6 +505,17 @@ dns_test_rdatafromstring(dns_rdata_t *rdata, dns_rdataclass_t rdclass,
 		return (result);
 	}
 
+	/*
+	 * Set characters which will be treated as valid multi-line RDATA
+	 * delimiters while reading the source string.  These should match
+	 * specials from lib/dns/master.c.
+	 */
+	specials[0] = 1;
+	specials['('] = 1;
+	specials[')'] = 1;
+	specials['"'] = 1;
+	isc_lex_setspecials(lex, specials);
+
 	/*
 	 * Point lexer at source.
 	 */