diff --git a/components/ds18b20/examples/ds18b20-read/main/ds18b20-read.c b/components/ds18b20/examples/ds18b20-read/main/ds18b20-read.c
index c5a3af46..27391d3b 100644
--- a/components/ds18b20/examples/ds18b20-read/main/ds18b20-read.c
+++ b/components/ds18b20/examples/ds18b20-read/main/ds18b20-read.c
@@ -14,9 +14,9 @@
 #define EXAMPLE_ONEWIRE_BUS_GPIO    18
 #define EXAMPLE_ONEWIRE_MAX_DS18B20 2
 
-int ds18b20_device_num = 0;
-float temperature = 0.0;
-ds18b20_device_handle_t ds18b20s[EXAMPLE_ONEWIRE_MAX_DS18B20];
+static int s_ds18b20_device_num = 0;
+static float s_temperature = 0.0;
+static ds18b20_device_handle_t s_ds18b20s[EXAMPLE_ONEWIRE_MAX_DS18B20];
 
 static const char *TAG = "DS18B20";