diff --git a/include/linux/msm_adc.h b/include/linux/msm_adc.h
index 5d5fb1b..51371a6 100644
--- a/include/linux/msm_adc.h
+++ b/include/linux/msm_adc.h
@@ -344,22 +344,24 @@
 int32_t adc_channel_request_conv(void *h, struct completion *conv_complete_evt);
 int32_t adc_channel_read_result(void *h, struct adc_chan_result *chan_result);
 #else
-int32_t adc_channel_open(uint32_t channel, void **h)
+static int32_t adc_channel_open(uint32_t channel, void **h)
 {
 	pr_err("%s.not supported.\n", __func__);
 	return -ENODEV;
 }
-int32_t adc_channel_close(void *h)
+static int32_t adc_channel_close(void *h)
 {
 	pr_err("%s.not supported.\n", __func__);
 	return -ENODEV;
 }
-int32_t adc_channel_request_conv(void *h, struct completion *conv_complete_evt)
+static int32_t
+adc_channel_request_conv(void *h, struct completion *conv_complete_evt)
 {
 	pr_err("%s.not supported.\n", __func__);
 	return -ENODEV;
 }
-int32_t adc_channel_read_result(void *h, struct adc_chan_result *chan_result)
+static int32_t
+adc_channel_read_result(void *h, struct adc_chan_result *chan_result)
 {
 	pr_err("%s.not supported.\n", __func__);
 	return -ENODEV;