diff --git a/arch/arm/src/stm32/stm32_pwm.c b/arch/arm/src/stm32/stm32_pwm.c
index 48640f98690..8f66239a11d 100644
--- a/arch/arm/src/stm32/stm32_pwm.c
+++ b/arch/arm/src/stm32/stm32_pwm.c
@@ -1300,8 +1300,8 @@ static int pwm_timer(FAR struct stm32_pwmtimer_s *priv,
 
   timclk = priv->pclk / prescaler;
 
-  reload = timclk / info->frequency - 1;
-  if (reload < 1)
+  reload = timclk / info->frequency;
+  if (reload < 2)
     {
       reload = 1;
     }
@@ -1309,6 +1309,10 @@ static int pwm_timer(FAR struct stm32_pwmtimer_s *priv,
     {
       reload = 65535;
     }
+  else
+    {
+      reload--;
+    }
 
   pwminfo("TIM%u PCLK: %u frequency: %u TIMCLK: %u prescaler: %u reload: %u\n",
           priv->timid, priv->pclk, info->frequency, timclk, prescaler, reload);
diff --git a/arch/arm/src/stm32l4/stm32l4_pwm.c b/arch/arm/src/stm32l4/stm32l4_pwm.c
index 3c0c8dab18f..71c4f1dad2c 100644
--- a/arch/arm/src/stm32l4/stm32l4_pwm.c
+++ b/arch/arm/src/stm32l4/stm32l4_pwm.c
@@ -841,8 +841,8 @@ static int stm32l4pwm_timer(FAR struct stm32l4_pwmtimer_s *priv,
 
   timclk = priv->pclk / prescaler;
 
-  reload = timclk / info->frequency - 1;
-  if (reload < 1)
+  reload = timclk / info->frequency;
+  if (reload < 2)
     {
       reload = 1;
     }
@@ -850,6 +850,10 @@ static int stm32l4pwm_timer(FAR struct stm32l4_pwmtimer_s *priv,
     {
       reload = 65535;
     }
+  else
+    {
+      reload--;
+    }
 
   pwminfo("TIM%u PCLK: %u frequency: %u TIMCLK: %u prescaler: %u reload: %u\n",
           priv->timid, priv->pclk, info->frequency, timclk, prescaler, reload);