diff --git a/ports/rp2/main.c b/ports/rp2/main.c
index 40374faff9..679bd440ac 100644
--- a/ports/rp2/main.c
+++ b/ports/rp2/main.c
@@ -76,6 +76,10 @@ int main(int argc, char **argv) {
     // This is a tickless port, interrupts should always trigger SEV.
     SCB->SCR |= SCB_SCR_SEVONPEND_Msk;
 
+    // set the MCU frequency and as a side effect the peripheral clock
+    // to 48 MHz.
+    set_sys_clock_khz(125000, false);
+
     #if MICROPY_HW_ENABLE_UART_REPL
     bi_decl(bi_program_feature("UART REPL"))
     setup_default_uart();
@@ -227,6 +231,12 @@ int main(int argc, char **argv) {
 
         gc_sweep_all();
         mp_deinit();
+        // Reset the MCU frequency
+        set_sys_clock_khz(125000, false);
+        #if MICROPY_HW_ENABLE_UART_REPL
+        setup_default_uart();
+        mp_uart_init();
+        #endif
     }
 
     return 0;
diff --git a/ports/rp2/modmachine.c b/ports/rp2/modmachine.c
index 5551bf723a..366711b770 100644
--- a/ports/rp2/modmachine.c
+++ b/ports/rp2/modmachine.c
@@ -95,6 +95,12 @@ static void mp_machine_set_freq(size_t n_args, const mp_obj_t *args) {
     if (!set_sys_clock_khz(freq / 1000, false)) {
         mp_raise_ValueError(MP_ERROR_TEXT("cannot change frequency"));
     }
+    // Option: Set PERI clock to system clock again
+    // clock_configure(clk_peri,
+    //                 0,
+    //                 CLOCKS_CLK_PERI_CTRL_AUXSRC_VALUE_CLK_SYS,
+    //                 SYS_CLK_KHZ * KHZ,
+    //                 SYS_CLK_KHZ * KHZ);
     #if MICROPY_HW_ENABLE_UART_REPL
     setup_default_uart();
     mp_uart_init();