1 files changed, 2 insertions, 0 deletions
diff --git a/awkgram.c b/awkgram.c
index 36947c41..10c55fa4 100644
--- a/awkgram.c
+++ b/awkgram.c
@@ -6272,6 +6272,8 @@ retry:
 				if (c == '\r')	/* allow MS-DOS files. bleah */
 					c = nextc(true);
 				if (c == '\n') {
+					if (do_posix)
+						fatal(_("POSIX does not allow physical newlines in string values"));
 					sourceline++;
 					continue;
 				}