diff --git a/tools/make-frozen.py b/tools/make-frozen.py
index a8706bf784..bc35d38342 100755
--- a/tools/make-frozen.py
+++ b/tools/make-frozen.py
@@ -50,7 +50,7 @@ print("const uint32_t mp_frozen_str_sizes[] = {")
 for f, st in modules:
     print("%d," % st.st_size)
 
-print("};")
+print("0};")
 
 print("const char mp_frozen_str_content[] = {")
 for f, st in modules:
@@ -82,4 +82,4 @@ for f, st in modules:
     chrs.append('\\0"')
     print("".join(chrs))
 
-print("};")
+print('"\\0"};')
diff --git a/tools/makemanifest.py b/tools/makemanifest.py
index 377f245596..9ef0368260 100644
--- a/tools/makemanifest.py
+++ b/tools/makemanifest.py
@@ -327,7 +327,7 @@ def main():
             b"    (qstr_pool_t*)&mp_qstr_const_pool, MP_QSTRnumber_of, 0, 0\n"
             b"};\n"
             b'const char mp_frozen_mpy_names[1] = {"\\0"};\n'
-            b"const mp_raw_code_t *const mp_frozen_mpy_content[0] = {};\n"
+            b"const mp_raw_code_t *const mp_frozen_mpy_content[1] = {NULL};\n"
         )
 
     # Generate output