diff --git a/include/libopencm3/stm32/f1/adc.h b/include/libopencm3/stm32/f1/adc.h
index 91a03bbb..e31181d6 100644
--- a/include/libopencm3/stm32/f1/adc.h
+++ b/include/libopencm3/stm32/f1/adc.h
@@ -417,8 +417,6 @@ void adc_calibration(uint32_t adc)
 void adc_calibrate_async(uint32_t adc);
 bool adc_is_calibrating(uint32_t adc);
 void adc_calibrate(uint32_t adc);
-void adc_on(uint32_t adc)
-	LIBOPENCM3_DEPRECATED("will be removed in the first release");
 
 END_DECLS
 
diff --git a/lib/stm32/f1/adc.c b/lib/stm32/f1/adc.c
index c915ae88..bdb899a3 100644
--- a/lib/stm32/f1/adc.c
+++ b/lib/stm32/f1/adc.c
@@ -400,24 +400,6 @@ void adc_calibrate(uint32_t adc)
 	while (adc_is_calibrating(adc));
 }
 
-/*---------------------------------------------------------------------------*/
-/** @brief ADC Power On
-
-If the ADC is in power-down mode then it is powered up. The application needs
-to wait a time of about 3 microseconds for stabilization before using the ADC.
-If the ADC is already on this function call will initiate a conversion.
-
-@deprecated to be removed in a later release
-
-@param[in] adc Unsigned int32. ADC block register address base @ref
-adc_reg_base.
-*/
-
-void adc_on(uint32_t adc)
-{
-	ADC_CR2(adc) |= ADC_CR2_ADON;
-}
-
 
 /*---------------------------------------------------------------------------*/
 /** @brief ADC Set the Sample Time for a Single Channel