diff --git a/arch/arm/src/sam34/sam_twi.c b/arch/arm/src/sam34/sam_twi.c
index 32490413548..a71525b6276 100644
--- a/arch/arm/src/sam34/sam_twi.c
+++ b/arch/arm/src/sam34/sam_twi.c
@@ -211,7 +211,7 @@ static struct twi_dev_s g_twi0;
 static struct twi_dev_s g_twi1;
 #endif
 
-struct i2c_ops_s g_twiops =
+static const struct i2c_ops_s g_twiops =
 {
   .transfer = twi_transfer
 #ifdef CONFIG_I2C_RESET
diff --git a/arch/arm/src/sama5/sam_twi.c b/arch/arm/src/sama5/sam_twi.c
index 853f93904b3..8944de9ed4b 100644
--- a/arch/arm/src/sama5/sam_twi.c
+++ b/arch/arm/src/sama5/sam_twi.c
@@ -307,7 +307,7 @@ static const struct twi_attr_s g_twi3attr =
 static struct twi_dev_s g_twi3;
 #endif
 
-struct i2c_ops_s g_twiops =
+static const struct i2c_ops_s g_twiops =
 {
   .transfer = twi_transfer
 #ifdef CONFIG_I2C_RESET
diff --git a/arch/arm/src/samv7/sam_twihs.c b/arch/arm/src/samv7/sam_twihs.c
index e8bbb3d003c..f11ae78cbb3 100644
--- a/arch/arm/src/samv7/sam_twihs.c
+++ b/arch/arm/src/samv7/sam_twihs.c
@@ -287,7 +287,7 @@ static const struct twi_attr_s g_twi2attr =
 static struct twi_dev_s g_twi2;
 #endif
 
-struct i2c_ops_s g_twiops =
+static const struct i2c_ops_s g_twiops =
 {
   .transfer = twi_transfer
 #ifdef CONFIG_I2C_RESET