diff --git a/ports/unix/coverage.c b/ports/unix/coverage.c
index 3c121a1538..538c32d614 100644
--- a/ports/unix/coverage.c
+++ b/ports/unix/coverage.c
@@ -161,6 +161,7 @@ STATIC mp_obj_t extra_coverage(void) {
         mp_printf(&mp_plat_print, "%x\n", 0x80000000); // should print unsigned
         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
     }
 
     // GC
diff --git a/tests/unix/extra_coverage.py.exp b/tests/unix/extra_coverage.py.exp
index 2e23b24585..6c483f7e54 100644
--- a/tests/unix/extra_coverage.py.exp
+++ b/tests/unix/extra_coverage.py.exp
@@ -13,6 +13,7 @@ false true
 80000000
 80000000
 abc
+%
 # GC
 0
 0