diff --git a/examples/stm32/f3/stm32f3-discovery/adc/adc.c b/examples/stm32/f3/stm32f3-discovery/adc/adc.c
index 5de126e..b081f8e 100644
--- a/examples/stm32/f3/stm32f3-discovery/adc/adc.c
+++ b/examples/stm32/f3/stm32f3-discovery/adc/adc.c
@@ -137,8 +137,7 @@ extern unsigned _stack;
 
 int main(void)
 {
-	int i, j;
-       	uint16_t temp, inc=0;
+       	uint16_t temp;
 
 	clock_setup();
 	gpio_setup();
diff --git a/examples/stm32/f3/stm32f3-discovery/i2c/i2c.c b/examples/stm32/f3/stm32f3-discovery/i2c/i2c.c
index dece4fd..5f26f7b 100644
--- a/examples/stm32/f3/stm32f3-discovery/i2c/i2c.c
+++ b/examples/stm32/f3/stm32f3-discovery/i2c/i2c.c
@@ -143,9 +143,6 @@ void clock_setup(void) {
 
 int main(void)
 {
-	int i, j;
-       	uint16_t temp, inc=0;
-	int wait;
 	clock_setup();
 	gpio_setup();
 	usart_setup();
@@ -155,7 +152,6 @@ int main(void)
 	write_i2c(I2C1, I2C_ACC_ADDR, ACC_CTRL_REG1_A, 1, data);
 	data[0]=0x08;
 	write_i2c(I2C1, I2C_ACC_ADDR, ACC_CTRL_REG4_A, 1, data);
-	uint8_t data_in[20];
 	uint16_t acc_x;
 
 	while (1) {
diff --git a/examples/stm32/f3/stm32f3-discovery/miniblink/miniblink.c b/examples/stm32/f3/stm32f3-discovery/miniblink/miniblink.c
index a062b4d..f3d9925 100644
--- a/examples/stm32/f3/stm32f3-discovery/miniblink/miniblink.c
+++ b/examples/stm32/f3/stm32f3-discovery/miniblink/miniblink.c
@@ -41,7 +41,7 @@ void gpio_setup(void)
 
 int main(void)
 {
-	int i, j;
+        int i;
 
 	gpio_setup();
 
diff --git a/examples/stm32/f3/stm32f3-discovery/spi/spi.c b/examples/stm32/f3/stm32f3-discovery/spi/spi.c
index b847468..0243d53 100644
--- a/examples/stm32/f3/stm32f3-discovery/spi/spi.c
+++ b/examples/stm32/f3/stm32f3-discovery/spi/spi.c
@@ -159,10 +159,8 @@ void clock_setup(void) {
 
 int main(void)
 {
-	int i, j;
-       	uint8_t temp, inc=0;
+        uint8_t temp;
 	int16_t gyr_x;
-	int wait;
 	clock_setup();
 	gpio_setup();
 	usart_setup();