diff --git a/src/drivers/TwiMaster.cpp b/src/drivers/TwiMaster.cpp
index f17d7168..76009278 100644
--- a/src/drivers/TwiMaster.cpp
+++ b/src/drivers/TwiMaster.cpp
@@ -10,7 +10,6 @@ using namespace Pinetime::Drivers;
 
 TwiMaster::TwiMaster(NRF_TWIM_Type* module, uint32_t frequency, uint8_t pinSda, uint8_t pinScl)
   : module {module}, frequency {frequency}, pinSda {pinSda}, pinScl {pinScl} {
-  mutex = xSemaphoreCreateBinary();
 }
 
 void TwiMaster::ConfigurePins() const {
@@ -30,6 +29,10 @@ void TwiMaster::ConfigurePins() const {
 }
 
 void TwiMaster::Init() {
+  if (mutex == nullptr) {
+    mutex = xSemaphoreCreateBinary();
+  }
+
   ConfigurePins();
 
   twiBaseAddress = module;
diff --git a/src/main.cpp b/src/main.cpp
index 4e94ab19..524035fc 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -81,8 +81,8 @@ Pinetime::Drivers::SpiNorFlash spiNorFlash {flashSpi};
 // The TWI device should work @ up to 400Khz but there is a HW bug which prevent it from
 // respecting correct timings. According to erratas heet, this magic value makes it run
 // at ~390Khz with correct timings.
-//static constexpr uint32_t MaxTwiFrequencyWithoutHardwareBug {0x06200000};
-Pinetime::Drivers::TwiMaster twiMaster {NRF_TWIM1, TWI_FREQUENCY_FREQUENCY_K250, pinTwiSda, pinTwiScl};
+static constexpr uint32_t MaxTwiFrequencyWithoutHardwareBug {0x06200000};
+Pinetime::Drivers::TwiMaster twiMaster {NRF_TWIM1, MaxTwiFrequencyWithoutHardwareBug, pinTwiSda, pinTwiScl};
 Pinetime::Drivers::Cst816S touchPanel {twiMaster, touchPanelTwiAddress};
 #ifdef PINETIME_IS_RECOVERY
 static constexpr bool isFactory = true;