diff --git a/arch/arm/src/stm32/stm32_i2c.c b/arch/arm/src/stm32/stm32_i2c.c
index e2b4953a2a2..6d06098b018 100644
--- a/arch/arm/src/stm32/stm32_i2c.c
+++ b/arch/arm/src/stm32/stm32_i2c.c
@@ -1929,7 +1929,7 @@ static int stm32_i2c_reset(FAR struct i2c_master_s *dev)
 
   stm32_i2c_init(priv);
 
-  /* Restore the frequency*/
+  /* Restore the frequency */
 
   stm32_i2c_setclock(priv, frequency);
   ret = OK;
diff --git a/arch/arm/src/stm32/stm32_i2c_alt.c b/arch/arm/src/stm32/stm32_i2c_alt.c
index 4f6ba6ea6fc..da50a9c2635 100644
--- a/arch/arm/src/stm32/stm32_i2c_alt.c
+++ b/arch/arm/src/stm32/stm32_i2c_alt.c
@@ -2374,7 +2374,7 @@ static int stm32_i2c_reset(FAR struct i2c_master_s * dev)
 
   stm32_i2c_init(priv);
 
-  /* Restore the frequency*/
+  /* Restore the frequency */
 
   stm32_i2c_setclock(priv, frequency);
   ret = OK;
diff --git a/arch/arm/src/stm32/stm32f30xxx_i2c.c b/arch/arm/src/stm32/stm32f30xxx_i2c.c
index fb5677954be..15b0cb63bb4 100644
--- a/arch/arm/src/stm32/stm32f30xxx_i2c.c
+++ b/arch/arm/src/stm32/stm32f30xxx_i2c.c
@@ -1929,7 +1929,7 @@ static int stm32_i2c_reset(FAR struct i2c_master_s * dev)
 
   stm32_i2c_init(priv);
 
-  /* Restore the frequency*/
+  /* Restore the frequency */
 
   stm32_i2c_setclock(priv, frequency);
   ret = OK;