diff --git a/embassy-stm32/src/adc/f3_v1_1.rs b/embassy-stm32/src/adc/f3_v1_1.rs
index 0bbfd3137..6915a8f1c 100644
--- a/embassy-stm32/src/adc/f3_v1_1.rs
+++ b/embassy-stm32/src/adc/f3_v1_1.rs
@@ -175,7 +175,12 @@ impl<'d, T: Instance> Adc<'d, T> {
     }
 
     pub fn resolution(&self) -> Resolution {
-        T::regs().cr1().read().res().into()
+        match T::regs().cr1().read().res() {
+            crate::pac::adc::vals::Res::TWELVEBIT => Resolution::TwelveBit,
+            crate::pac::adc::vals::Res::TENBIT => Resolution::TenBit,
+            crate::pac::adc::vals::Res::EIGHTBIT => Resolution::EightBit,
+            crate::pac::adc::vals::Res::SIXBIT => Resolution::SixBit,
+        }
     }
 
     pub fn enable_vref(&self) -> Vref<T> {
diff --git a/embassy-stm32/src/adc/resolution.rs b/embassy-stm32/src/adc/resolution.rs
index b1597a821..383980b5a 100644
--- a/embassy-stm32/src/adc/resolution.rs
+++ b/embassy-stm32/src/adc/resolution.rs
@@ -48,22 +48,6 @@ impl From<Resolution> for crate::pac::adc::vals::Res {
     }
 }
 
-impl From<crate::pac::adc::vals::Res> for Resolution {
-    fn from(res: crate::pac::adc::vals::Res) -> Resolution {
-        match res {
-            #[cfg(adc_v4)]
-            crate::pac::adc::vals::Res::SIXTEENBIT => Resolution::SixteenBit,
-            #[cfg(adc_v4)]
-            crate::pac::adc::vals::Res::FOURTEENBITV => Resolution::FourteenBit,
-            crate::pac::adc::vals::Res::TWELVEBIT => Resolution::TwelveBit,
-            crate::pac::adc::vals::Res::TENBIT => Resolution::TenBit,
-            crate::pac::adc::vals::Res::EIGHTBIT => Resolution::EightBit,
-            #[cfg(any(adc_v1, adc_v2, adc_v3, adc_g0, adc_f3, adc_f3_v1_1, adc_f3_v3))]
-            crate::pac::adc::vals::Res::SIXBIT => Resolution::SixBit,
-        }
-    }
-}
-
 impl Resolution {
     pub fn to_max_count(&self) -> u32 {
         match self {