diff --git a/ports/unix/variants/coverage/mpconfigvariant.h b/ports/unix/variants/coverage/mpconfigvariant.h
index 47ed4bc46c..9c98ca2f62 100644
--- a/ports/unix/variants/coverage/mpconfigvariant.h
+++ b/ports/unix/variants/coverage/mpconfigvariant.h
@@ -30,10 +30,6 @@
 // Set base feature level.
 #define MICROPY_CONFIG_ROM_LEVEL (MICROPY_CONFIG_ROM_LEVEL_EXTRA_FEATURES)
 
-// Disable some features that come enabled by default with the feature level.
-#define MICROPY_PY_BUILTINS_EXECFILE            (0)
-#define MICROPY_PY_SYS_STDIO_BUFFER             (0)
-
 // Enable additional features.
 #define MICROPY_DEBUG_PARSE_RULE_NAME  (1)
 #define MICROPY_TRACKED_ALLOC           (1)
diff --git a/ports/unix/variants/dev/mpconfigvariant.h b/ports/unix/variants/dev/mpconfigvariant.h
index 0603394247..0084d00dd6 100644
--- a/ports/unix/variants/dev/mpconfigvariant.h
+++ b/ports/unix/variants/dev/mpconfigvariant.h
@@ -27,10 +27,6 @@
 // Set base feature level.
 #define MICROPY_CONFIG_ROM_LEVEL (MICROPY_CONFIG_ROM_LEVEL_EXTRA_FEATURES)
 
-// Disable some features that come enabled by default with the feature level.
-#define MICROPY_PY_BUILTINS_EXECFILE            (0)
-#define MICROPY_PY_SYS_STDIO_BUFFER             (0)
-
 // Enable some additional features.
 #define MICROPY_REPL_EMACS_WORDS_MOVE           (1)
 #define MICROPY_REPL_EMACS_EXTRA_WORDS_MOVE     (1)