diff --git a/libraries/ms-common/inc/arm/pwm_mcu.h b/libraries/ms-common/inc/arm/pwm_mcu.h
index 1fa038348..3b8e1bd88 100644
--- a/libraries/ms-common/inc/arm/pwm_mcu.h
+++ b/libraries/ms-common/inc/arm/pwm_mcu.h
@@ -6,6 +6,7 @@ typedef enum {
   PWM_TIMER_1 = 0,
   // PWM_TIMER_2,  // Requisitioned to back the soft_timer module.
   PWM_TIMER_3,
+  PWM_TIMER_4,
   PWM_TIMER_14,
   PWM_TIMER_15,
   PWM_TIMER_16,
diff --git a/libraries/ms-common/inc/x86/pwm_mcu.h b/libraries/ms-common/inc/x86/pwm_mcu.h
index 2308f7aa1..ff65cdb59 100644
--- a/libraries/ms-common/inc/x86/pwm_mcu.h
+++ b/libraries/ms-common/inc/x86/pwm_mcu.h
@@ -8,6 +8,7 @@ typedef enum {
   PWM_TIMER_1 = 0,
   // PWM_TIMER_2,  // Requisitioned to back the soft_timer module.
   PWM_TIMER_3,
+  PWM_TIMER_4,
   PWM_TIMER_14,
   PWM_TIMER_15,
   PWM_TIMER_16,
diff --git a/libraries/ms-common/src/arm/pwm.c b/libraries/ms-common/src/arm/pwm.c
index f842a2809..cb126bf91 100644
--- a/libraries/ms-common/src/arm/pwm.c
+++ b/libraries/ms-common/src/arm/pwm.c
@@ -16,6 +16,7 @@ typedef enum APBClk {
 static uint16_t s_period_us[NUM_PWM_TIMERS] = {
   [PWM_TIMER_1] = 0,   //
   [PWM_TIMER_3] = 0,   //
+  [PWM_TIMER_4] = 0,   // This timer is typically used by I2C
   [PWM_TIMER_14] = 0,  //
   [PWM_TIMER_15] = 0,  //
   [PWM_TIMER_16] = 0,  //
@@ -25,6 +26,7 @@ static uint16_t s_period_us[NUM_PWM_TIMERS] = {
 static TIM_TypeDef *s_timer_def[NUM_PWM_TIMERS] = {
   [PWM_TIMER_1] = TIM1,    //
   [PWM_TIMER_3] = TIM3,    //
+  [PWM_TIMER_4] = TIM4,    // Typically used for I2C
   [PWM_TIMER_14] = TIM14,  //
   [PWM_TIMER_15] = TIM15,  //
   [PWM_TIMER_16] = TIM16,  //
@@ -39,6 +41,9 @@ static APBClk prv_enable_periph_clock(PwmTimer timer) {
     case PWM_TIMER_3:
       RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
       return APB1;
+    case PWM_TIMER_4:
+      RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
+      return APB1;
     case PWM_TIMER_14:
       RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM14, ENABLE);
       return APB1;