diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index 4a6073d..e01d067 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -4419,7 +4419,9 @@
 		// get length of substitution part
 		sublen = vim_regsub_multi(&regmatch,
 				    sub_firstlnum - regmatch.startpos[0].lnum,
-			       sub, sub_firstline, FALSE, magic_isset(), TRUE);
+			       sub, sub_firstline, 0,
+			       REGSUB_BACKSLASH
+				    | (magic_isset() ? REGSUB_MAGIC : 0));
 #ifdef FEAT_EVAL
 		--textlock;
 
@@ -4528,7 +4530,9 @@
 #endif
 		(void)vim_regsub_multi(&regmatch,
 				    sub_firstlnum - regmatch.startpos[0].lnum,
-				      sub, new_end, TRUE, magic_isset(), TRUE);
+				      sub, new_end, sublen,
+				      REGSUB_COPY | REGSUB_BACKSLASH
+					 | (magic_isset() ? REGSUB_MAGIC : 0));
 #ifdef FEAT_EVAL
 		--textlock;
 #endif