diff --git a/ports/unix/coverage.c b/ports/unix/coverage.c
index 9201dab12d..b041141f0f 100644
--- a/ports/unix/coverage.c
+++ b/ports/unix/coverage.c
@@ -220,6 +220,7 @@ static mp_obj_t extra_coverage(void) {
         mp_printf(&mp_plat_print, "%X\n", 0x80000000); // should print unsigned
         mp_printf(&mp_plat_print, "abc\n%"); // string ends in middle of format specifier
         mp_printf(&mp_plat_print, "%%\n"); // literal % character
+        mp_printf(&mp_plat_print, ".%-3s.\n", "a"); // left adjust
     }
 
     // GC
diff --git a/tests/ports/unix/extra_coverage.py.exp b/tests/ports/unix/extra_coverage.py.exp
index 1549168228..3775036bb3 100644
--- a/tests/ports/unix/extra_coverage.py.exp
+++ b/tests/ports/unix/extra_coverage.py.exp
@@ -14,6 +14,7 @@ false true
 80000000
 abc
 %
+.a  .
 # GC
 0
 0