diff --git a/firmware/target/arm/as3525/ata_sd_as3525.c b/firmware/target/arm/as3525/ata_sd_as3525.c
index 99bf668ec4..0afe735e53 100644
--- a/firmware/target/arm/as3525/ata_sd_as3525.c
+++ b/firmware/target/arm/as3525/ata_sd_as3525.c
@@ -854,7 +854,7 @@ void sd_enable(bool on)
     extern int buttonlight_is_on;
 #endif
 
-#ifdef HAVE_HOTSWAP
+#if defined(HAVE_HOTSWAP) && defined (HAVE_ADJUSTABLE_CPU_VOLTAGE)
     static bool cpu_boosted = false;
 #endif
 
@@ -880,23 +880,24 @@ void sd_enable(bool on)
 #endif /* HAVE_MULTIDRIVE */
         sd_enabled = true;
 
-#ifdef HAVE_HOTSWAP
+#if defined(HAVE_HOTSWAP) && defined (HAVE_ADJUSTABLE_CPU_VOLTAGE)
         if(card_detect_target())  /* If SD card present Boost cpu for voltage */
         {
             cpu_boosted = true;
             cpu_boost(true);
         }
-#endif
+#endif  /* defined(HAVE_HOTSWAP) && defined (HAVE_ADJUSTABLE_CPU_VOLTAGE) */
     }
     else
     {
-#ifdef HAVE_HOTSWAP
+#if defined(HAVE_HOTSWAP) && defined (HAVE_ADJUSTABLE_CPU_VOLTAGE)
         if(cpu_boosted)
         {
             cpu_boost(false);
             cpu_boosted = false;
         }
-#endif
+#endif  /* defined(HAVE_HOTSWAP) && defined (HAVE_ADJUSTABLE_CPU_VOLTAGE) */
+
         sd_enabled = false;
 
 #ifdef HAVE_MULTIDRIVE
diff --git a/firmware/target/arm/as3525/system-as3525.c b/firmware/target/arm/as3525/system-as3525.c
index 13b406a6b8..2e6b6d4085 100644
--- a/firmware/target/arm/as3525/system-as3525.c
+++ b/firmware/target/arm/as3525/system-as3525.c
@@ -369,12 +369,14 @@ void set_cpu_frequency(long frequency)
 {
     if(frequency == CPUFREQ_MAX)
     {
+#ifdef HAVE_ADJUSTABLE_CPU_VOLTAGE
         /* Increasing frequency so boost voltage before change */
         ascodec_write(AS3514_CVDD_DCDC3, (AS314_CP_DCDC3_SETTING | CVDD_1_20));
 
         /* Some players run a bit low so use 1.175 volts instead of 1.20  */
         /* Wait for voltage to be at least 1.175v before making fclk > 200 MHz */
         while(adc_read(ADC_CVDD) < 470); /* 470 * .0025 = 1.175V */
+#endif  /*  HAVE_ADJUSTABLE_CPU_VOLTAGE */
 
         asm volatile(
             "mrc p15, 0, r0, c1, c0  \n"
@@ -399,8 +401,10 @@ void set_cpu_frequency(long frequency)
             "mcr p15, 0, r0, c1, c0  \n"
             : : : "r0" );
 
+#ifdef HAVE_ADJUSTABLE_CPU_VOLTAGE
         /* Decreasing frequency so reduce voltage after change */
         ascodec_write(AS3514_CVDD_DCDC3, (AS314_CP_DCDC3_SETTING | CVDD_1_10));
+#endif  /*  HAVE_ADJUSTABLE_CPU_VOLTAGE */
 
         cpu_frequency = CPUFREQ_NORMAL;
     }