diff --git a/ports/espressif/bindings/espidf/__init__.h b/ports/espressif/bindings/espidf/__init__.h
index 5ace1b3ada..15a669cc28 100644
--- a/ports/espressif/bindings/espidf/__init__.h
+++ b/ports/espressif/bindings/espidf/__init__.h
@@ -41,9 +41,6 @@ NORETURN void mp_raise_espidf_MemoryError(void);
 void raise_esp_error(esp_err_t err) NORETURN;
 #define CHECK_ESP_RESULT(x) do { int res = (x); if (res != ESP_OK) raise_esp_error(res); } while (0)
 
-void common_hal_espidf_reserve_psram(void);
-bool common_hal_espidf_set_reserved_psram(size_t amount);
-size_t common_hal_espidf_get_reserved_psram(void);
 size_t common_hal_espidf_get_total_psram(void);
 intptr_t common_hal_espidf_get_psram_start(void);
 intptr_t common_hal_espidf_get_psram_end(void);
diff --git a/ports/espressif/common-hal/espidf/__init__.c b/ports/espressif/common-hal/espidf/__init__.c
index f1fa2a0ed7..d96c608c09 100644
--- a/ports/espressif/common-hal/espidf/__init__.c
+++ b/ports/espressif/common-hal/espidf/__init__.c
@@ -54,21 +54,6 @@ static size_t psram_size_usable(void) {
     #endif
 }
 
-bool common_hal_espidf_set_reserved_psram(size_t amount) {
-    #ifdef CONFIG_SPIRAM
-    if (!esp_psram_is_initialized()) {
-        return false;
-    }
-    if (amount > psram_size_usable()) {
-        return false;
-    }
-    reserved_psram = amount;
-    return true;
-    #else
-    return false;
-    #endif
-}
-
 size_t common_hal_espidf_get_total_psram(void) {
     return psram_size_usable();
 }