diff --git a/include/libopencm3/stm32/f3/adc.h b/include/libopencm3/stm32/f3/adc.h
index f54b8d10..6a0bfe5b 100644
--- a/include/libopencm3/stm32/f3/adc.h
+++ b/include/libopencm3/stm32/f3/adc.h
@@ -334,11 +334,10 @@
 /* ADCALDIF: Differential mode for calibration */
 #define ADC_CR_ADCALDIF		(1 << 30)
 
-/* ADVREGEN: ADC voltage regulador enable */
-#define ADC_CR_ADVREGEN_INTERMEDIATE	(0x0 << 28)
+/** ADVREGEN: ADC voltage regulator enable */
 #define ADC_CR_ADVREGEN_ENABLE		(0x1 << 28)
 #define ADC_CR_ADVREGEN_DISABLE		(0x2 << 28)
-/* --- Bit 0x3 reserved --- */
+#define ADC_CR_ADVREGEN_MASK		(0x3 << 28)
 
 /* JADSTP: ADC stop of injected conversion command */
 #define ADC_CR_JADSTP		(1 << 5)
@@ -920,6 +919,8 @@ bool adc_awd(uint32_t adc);
 /*void adc_set_dma_terminate(uint32_t adc);*/
 void adc_enable_temperature_sensor(void);
 void adc_disable_temperature_sensor(void);
+void adc_enable_regulator(uint32_t adc);
+void adc_disable_regulator(uint32_t adc);
 
 END_DECLS
 
diff --git a/lib/stm32/f3/adc.c b/lib/stm32/f3/adc.c
index f857f7ed..2b3a4c93 100644
--- a/lib/stm32/f3/adc.c
+++ b/lib/stm32/f3/adc.c
@@ -1197,5 +1197,30 @@ void adc_disable_temperature_sensor()
 
 /*---------------------------------------------------------------------------*/
 
+/**
+ * Enable the ADC Voltage regulator
+ * Before any use of the ADC, the ADC Voltage regulator must be enabled.
+ * You must wait up to 10uSecs afterwards before trying anything else.
+ * @param[in] adc ADC block register address base
+ * @sa adc_disable_regulator
+ */
+void adc_enable_regulator(uint32_t adc)
+{
+	ADC_CR(adc) &= ~ADC_CR_ADVREGEN_MASK;
+	ADC_CR(adc) |= ADC_CR_ADVREGEN_ENABLE;
+}
+
+/**
+ * Disable the ADC Voltage regulator
+ * You can disable the adc vreg when not in use to save power
+ * @param[in] adc ADC block register address base
+ * @sa adc_enable_regulator
+ */
+void adc_disable_regulator(uint32_t adc)
+{
+	ADC_CR(adc) &= ~ADC_CR_ADVREGEN_MASK;
+	ADC_CR(adc) |= ADC_CR_ADVREGEN_DISABLE;
+}
+
 /**@}*/