diff --git a/src/message_test.c b/src/message_test.c
index e5fd562..4d52889 100644
--- a/src/message_test.c
+++ b/src/message_test.c
@@ -40,6 +40,7 @@
 char *fmt_5S   = "%5S";
 char *fmt_06b  = "%06b";
 char *fmt_06pb = "%1$0.*2$b";
+char *fmt_06pb2 = "%2$0*1$b";
 char *fmt_212s = "%2$s %1$s %2$s";
 char *fmt_21s  = "%2$s %1$s";
 
@@ -442,6 +443,11 @@
 	assert(bsize == 0 || STRNCMP(buf, "deadbeef", bsize_int) == 0);
 	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');
 
+	n = vim_snprintf(buf, bsize, fmt_06pb2, 6, (uvarnumber_T)12);
+	assert(n == 6);
+	assert(bsize == 0 || STRNCMP(buf, "001100", bsize_int) == 0);
+	assert(bsize == 0 || buf[MIN(n, bsize_int)] == '\0');
+
 	n = vim_snprintf(buf, bsize, fmt_06pb, (uvarnumber_T)12, 6);
 	assert(n == 6);
 	assert(bsize == 0 || STRNCMP(buf, "001100", bsize_int) == 0);