diff --git a/jerry-core/ecma/base/ecma-helpers-string.c b/jerry-core/ecma/base/ecma-helpers-string.c
index 1dd3052b34..9a8a0c2595 100644
--- a/jerry-core/ecma/base/ecma-helpers-string.c
+++ b/jerry-core/ecma/base/ecma-helpers-string.c
@@ -744,22 +744,6 @@ ecma_string_get_number_in_desc_size (const uint32_t uint32_number) /**< number i
   return size;
 } /* ecma_string_get_number_in_desc_size */
 
-/**
- * Get size of container heap number of ecma-string
- *
- * Note: the number size and length are equal
- *
- * @return number of bytes in the buffer
- */
-static inline lit_utf8_size_t __attr_always_inline___
-ecma_string_get_heap_number_size (jmem_cpointer_t number_cp) /**< Compressed pointer to an ecma_number_t */
-{
-  const ecma_number_t *num_p = ECMA_GET_NON_NULL_POINTER (ecma_number_t, number_cp);
-  lit_utf8_byte_t buffer[ECMA_MAX_CHARS_IN_STRINGIFIED_NUMBER];
-
-  return ecma_number_to_utf8_string (*num_p, buffer, sizeof (buffer));
-} /* ecma_string_get_heap_number_size */
-
 /**
  * Checks whether the given string is a sequence of ascii characters.
  */
diff --git a/jerry-core/ecma/base/ecma-helpers.c b/jerry-core/ecma/base/ecma-helpers.c
index a284fbc12b..3470216395 100644
--- a/jerry-core/ecma/base/ecma-helpers.c
+++ b/jerry-core/ecma/base/ecma-helpers.c
@@ -340,23 +340,6 @@ ecma_get_property_list (const ecma_object_t *object_p) /**< object or lexical en
                            object_p->property_list_or_bound_object_cp);
 } /* ecma_get_property_list */
 
-/**
- * Set object's/lexical environment's property list.
- *
- * See also:
- *          ecma_op_object_get_property_names
- */
-static inline void
-ecma_set_property_list (ecma_object_t *object_p, /**< object or lexical environment */
-                        ecma_property_header_t *property_list_p) /**< properties' list */
-{
-  JERRY_ASSERT (object_p != NULL);
-  JERRY_ASSERT (!ecma_is_lexical_environment (object_p)
-                || ecma_get_lex_env_type (object_p) == ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE);
-
-  ECMA_SET_POINTER (object_p->property_list_or_bound_object_cp, property_list_p);
-} /* ecma_set_property_list */
-
 /**
  * Get lexical environment's 'provideThis' property
  */