diff --git a/arch/arm/src/stm32/stm32f30xxx_i2c.c b/arch/arm/src/stm32/stm32f30xxx_i2c.c
index 12ee98998a..29f084590b 100644
--- a/arch/arm/src/stm32/stm32f30xxx_i2c.c
+++ b/arch/arm/src/stm32/stm32f30xxx_i2c.c
@@ -1030,7 +1030,7 @@ static void stm32_i2c_tracedump(FAR struct stm32_i2c_priv_s *priv)
   syslog(LOG_DEBUG, "Elapsed time: %ld\n",
          (long)(clock_systimer() - priv->start_time));
 
-  for (i = 0; i <= priv->tndx; i++)
+  for (i = 0; i < priv->tndx; i++)
     {
       trace = &priv->trace[i];
       syslog(LOG_DEBUG,
diff --git a/arch/arm/src/stm32/stm32f40xxx_i2c.c b/arch/arm/src/stm32/stm32f40xxx_i2c.c
index cfe3002220..6cbe0979d6 100644
--- a/arch/arm/src/stm32/stm32f40xxx_i2c.c
+++ b/arch/arm/src/stm32/stm32f40xxx_i2c.c
@@ -970,7 +970,7 @@ static void stm32_i2c_tracedump(FAR struct stm32_i2c_priv_s *priv)
   syslog(LOG_DEBUG, "Elapsed time: %ld\n",
          (long)(clock_systimer() - priv->start_time));
 
-  for (i = 0; i <= priv->tndx; i++)
+  for (i = 0; i < priv->tndx; i++)
     {
       trace = &priv->trace[i];
       syslog(LOG_DEBUG,