diff --git a/CHANGES b/CHANGES
index 96cfec72c2..dccc823821 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+4862.	[bug]		The rdata flags for RRSIG was not being properly set
+			when constructing a rdataslab. [RT #46978]
+
 4861.	[bug]		The isc_crc64 unit test was not endian independent.
 			[RT #46973]
 
diff --git a/lib/dns/rdataslab.c b/lib/dns/rdataslab.c
index 55672a8d14..8d3edc95c1 100644
--- a/lib/dns/rdataslab.c
+++ b/lib/dns/rdataslab.c
@@ -320,7 +320,7 @@ dns_rdataslab_fromrdataset(dns_rdataset_t *rdataset, isc_mem_t *mctx,
 		 * Store the per RR meta data.
 		 */
 		if (rdataset->type == dns_rdatatype_rrsig) {
-			*rawbuf++ |= (x[i].rdata.flags & DNS_RDATA_OFFLINE) ?
+			*rawbuf++ = (x[i].rdata.flags & DNS_RDATA_OFFLINE) ?
 					    DNS_RDATASLAB_OFFLINE : 0;
 		}
 		memmove(rawbuf, x[i].rdata.data, x[i].rdata.length);