Index: usr.sbin/newsyslog/newsyslog.c
===================================================================
--- usr.sbin/newsyslog/newsyslog.c
+++ usr.sbin/newsyslog/newsyslog.c
@@ -105,7 +105,7 @@
 #define	COMPRESS_SUFFIX_ZST	".zst"
 #endif
 
-#define	COMPRESS_SUFFIX_MAXLEN	MAX(MAX(sizeof(COMPRESS_SUFFIX_GZ),sizeof(COMPRESS_SUFFIX_BZ2)),sizeof(COMPRESS_SUFFIX_XZ))
+#define	COMPRESS_SUFFIX_MAXLEN	MAX(MAX(MAX(sizeof(COMPRESS_SUFFIX_GZ),sizeof(COMPRESS_SUFFIX_BZ2)),sizeof(COMPRESS_SUFFIX_XZ)),sizeof(COMPRESS_SUFFIX_ZST))
 
 /*
  * Compression types
@@ -2027,7 +2027,7 @@
 	char zresult[MAXPATHLEN];
 	char command[BUFSIZ];
 	char **args;
-	int c;
+	int c, i;
 
 	assert(zwork != NULL);
 	pgm_path = NULL;
@@ -2043,10 +2043,10 @@
 				(void) strlcat(zresult,
 				    compress_type[c].suffix, sizeof(zresult));
 				/* the first argument is always NULL, skip it */
-				for (c = 1; c < ARGS_NUM; c++) {
-					if (compress_type[c].args[c] == NULL)
+				for (i = 1; i < ARGS_NUM; i++) {
+					if (compress_type[c].args[i] == NULL)
 						break;
-					args[c] = compress_type[c].args[c];
+					args[i] = compress_type[c].args[i];
 				}
 				break;
 			}
Index: usr.sbin/newsyslog/tests/legacy_test.sh
===================================================================
--- usr.sbin/newsyslog/tests/legacy_test.sh
+++ usr.sbin/newsyslog/tests/legacy_test.sh
@@ -498,6 +498,12 @@
 echo "$LOGFPATH	640  3	   *	@T00  NCJ" > newsyslog.conf
 tests_normal_rotate ".bz2"
 
+echo "$LOGFPATH	640  3	   *	@T00  NCX" > newsyslog.conf
+tests_normal_rotate ".xz"
+
+echo "$LOGFPATH	640  3	   *	@T00  NCY" > newsyslog.conf
+tests_normal_rotate ".zst"
+
 # Normal, archive dir
 echo "$LOGFPATH	640  3	   *	@T00  NC" > newsyslog.conf
 tests_normal_rotate "" "${TMPDIR}/alog/"
@@ -508,6 +514,12 @@
 echo "$LOGFPATH	640  3	   *	@T00  NCJ" > newsyslog.conf
 tests_normal_rotate ".bz2" "${TMPDIR}/alog/"
 
+echo "$LOGFPATH	640  3	   *	@T00  NCX" > newsyslog.conf
+tests_normal_rotate ".xz" "${TMPDIR}/alog/"
+
+echo "$LOGFPATH	640  3	   *	@T00  NCY" > newsyslog.conf
+tests_normal_rotate ".zst" "${TMPDIR}/alog/"
+
 # Time based, no archive dir
 echo "$LOGFPATH	640  3	   *	@T00  NC" > newsyslog.conf
 tests_time_rotate
@@ -518,6 +530,12 @@
 echo "$LOGFPATH	640  3	   *	@T00  NCJ" > newsyslog.conf
 tests_time_rotate "bz2" ""
 
+echo "$LOGFPATH	640  3	   *	@T00  NCX" > newsyslog.conf
+tests_time_rotate "xz" ""
+
+echo "$LOGFPATH	640  3	   *	@T00  NCY" > newsyslog.conf
+tests_time_rotate "zst" ""
+
 # Time based, archive dir
 echo "$LOGFPATH	640  3	   *	@T00  NC" > newsyslog.conf
 tests_time_rotate "" "${TMPDIR}/alog/"
@@ -528,6 +546,12 @@
 echo "$LOGFPATH	640  3	   *	@T00  NCJ" > newsyslog.conf
 tests_time_rotate "bz2" "${TMPDIR}/alog/"
 
+echo "$LOGFPATH	640  3	   *	@T00  NCX" > newsyslog.conf
+tests_time_rotate "xz" "${TMPDIR}/alog/"
+
+echo "$LOGFPATH	640  3	   *	@T00  NCY" > newsyslog.conf
+tests_time_rotate "zst" "${TMPDIR}/alog/"
+
 # RFC-5424; Normal, no archive dir
 echo "$LOGFPATH5424	640  3	   *	@T00  NCT" > newsyslog.conf
 echo "$LOGFPATH	640  3	   *	@T00  NC" >> newsyslog.conf