diff --git a/py/compile.c b/py/compile.c
index d40d8a1ff..df6dab063 100644
--- a/py/compile.c
+++ b/py/compile.c
@@ -2649,7 +2649,7 @@ STATIC void compile_const_object(compiler_t *comp, mp_parse_node_struct_t *pns)
 }
 
 typedef void (*compile_function_t)(compiler_t*, mp_parse_node_struct_t*);
-STATIC compile_function_t compile_function[] = {
+STATIC const compile_function_t compile_function[] = {
 #define nc NULL
 #define c(f) compile_##f
 #define DEF_RULE(rule, comp, kind, ...) comp,
diff --git a/py/lexer.c b/py/lexer.c
index 1639740d3..820f91be7 100644
--- a/py/lexer.c
+++ b/py/lexer.c
@@ -190,7 +190,7 @@ STATIC void indent_pop(mp_lexer_t *lex) {
 //     c<op> = continue with <op>, if this opchar matches then continue matching
 // this means if the start of two ops are the same then they are equal til the last char
 
-STATIC const char *tok_enc =
+STATIC const char *const tok_enc =
     "()[]{},:;@~" // singles
     "<e=c<e="     // < <= << <<=
     ">e=c>e="     // > >= >> >>=
@@ -227,7 +227,7 @@ STATIC const uint8_t tok_enc_kind[] = {
 };
 
 // must have the same order as enum in lexer.h
-STATIC const char *tok_kw[] = {
+STATIC const char *const tok_kw[] = {
     "False",
     "None",
     "True",
diff --git a/py/map.c b/py/map.c
index 445b20660..0916ec522 100644
--- a/py/map.c
+++ b/py/map.c
@@ -49,7 +49,7 @@ const mp_map_t mp_const_empty_map = {
 // The first set of sizes are chosen so the allocation fits exactly in a
 // 4-word GC block, and it's not so important for these small values to be
 // prime.  The latter sizes are prime and increase at an increasing rate.
-STATIC uint16_t hash_allocation_sizes[] = {
+STATIC const uint16_t hash_allocation_sizes[] = {
     0, 2, 4, 6, 8, 10, 12, // +2
     17, 23, 29, 37, 47, 59, 73, // *1.25
     97, 127, 167, 223, 293, 389, 521, 691, 919, 1223, 1627, 2161, // *1.33
diff --git a/py/objdict.c b/py/objdict.c
index cc1f502d0..04da2bf62 100644
--- a/py/objdict.c
+++ b/py/objdict.c
@@ -414,7 +414,7 @@ typedef enum _mp_dict_view_kind_t {
     MP_DICT_VIEW_VALUES,
 } mp_dict_view_kind_t;
 
-STATIC char *mp_dict_view_names[] = {"dict_items", "dict_keys", "dict_values"};
+STATIC const char *const mp_dict_view_names[] = {"dict_items", "dict_keys", "dict_values"};
 
 typedef struct _mp_obj_dict_view_it_t {
     mp_obj_base_t base;
diff --git a/py/parse.c b/py/parse.c
index 0b60569d0..7da484c49 100644
--- a/py/parse.c
+++ b/py/parse.c
@@ -104,7 +104,7 @@ enum {
 #undef one_or_more
 #undef DEF_RULE
 
-STATIC const rule_t *rules[] = {
+STATIC const rule_t *const rules[] = {
 #define DEF_RULE(rule, comp, kind, ...) &rule_##rule,
 #include "py/grammar.h"
 #undef DEF_RULE
diff --git a/py/repl.c b/py/repl.c
index 4006bbfb6..997d80005 100644
--- a/py/repl.c
+++ b/py/repl.c
@@ -223,7 +223,7 @@ mp_uint_t mp_repl_autocomplete(const char *str, mp_uint_t len, const mp_print_t
                 // If there're no better alternatives, and if it's first word
                 // in the line, try to complete "import".
                 if (s_start == org_str) {
-                    static char import_str[] = "import ";
+                    static const char import_str[] = "import ";
                     if (memcmp(s_start, import_str, s_len) == 0) {
                         *compl_str = import_str + s_len;
                         return sizeof(import_str) - 1 - s_len;
diff --git a/py/vmentrytable.h b/py/vmentrytable.h
index f3143b5d1..9df1e40a3 100644
--- a/py/vmentrytable.h
+++ b/py/vmentrytable.h
@@ -29,7 +29,7 @@
 #pragma clang diagnostic ignored "-Winitializer-overrides"
 #endif // __clang__
 
-static void* entry_table[256] = {
+static const void *const entry_table[256] = {
     [0 ... 255] = &&entry_default,
     [MP_BC_LOAD_CONST_FALSE] = &&entry_MP_BC_LOAD_CONST_FALSE,
     [MP_BC_LOAD_CONST_NONE] = &&entry_MP_BC_LOAD_CONST_NONE,