diff --git a/src/adiv5_swdp.c b/src/adiv5_swdp.c
index b53fcb5..e917d1f 100644
--- a/src/adiv5_swdp.c
+++ b/src/adiv5_swdp.c
@@ -117,7 +117,7 @@ static uint32_t adiv5_swdp_low_access(ADIv5_DP_t *dp, uint8_t RnW,
 	bool APnDP = addr & ADIV5_APnDP;
 	addr &= 0xff;
 	uint8_t request = 0x81;
-	uint32_t response;
+	uint32_t response = 0;
 	uint8_t ack;
 
 	if(APnDP && dp->fault) return 0;
diff --git a/src/nrf51.c b/src/nrf51.c
index fec5afb..88e63f5 100644
--- a/src/nrf51.c
+++ b/src/nrf51.c
@@ -37,7 +37,7 @@ static bool nrf51_cmd_read_hwid(target *t);
 static bool nrf51_cmd_read_fwid(target *t);
 static bool nrf51_cmd_read_deviceid(target *t);
 static bool nrf51_cmd_read_deviceaddr(target *t);
-static bool nrf51_cmd_read_help();
+static bool nrf51_cmd_read_help(void);
 static bool nrf51_cmd_read(target *t, int argc, const char *argv[]);
 
 const struct command_s nrf51_cmd_list[] = {
@@ -308,7 +308,7 @@ static bool nrf51_cmd_read_deviceaddr(target *t)
 
 	return true;
 }
-static bool nrf51_cmd_read_help()
+static bool nrf51_cmd_read_help(void)
 {
 	const struct command_s *c;
 
@@ -330,6 +330,6 @@ static bool nrf51_cmd_read(target *t, int argc, const char *argv[])
 			return !c->handler(t, argc - 1, &argv[1]);
 	}
 
-	return nrf51_cmd_read_help(t);
+	return nrf51_cmd_read_help();
 }
 
diff --git a/src/stm32l0.c b/src/stm32l0.c
index e46ac27..0c35577 100644
--- a/src/stm32l0.c
+++ b/src/stm32l0.c
@@ -104,7 +104,7 @@ static const struct command_s stm32lx_cmd_list[] = {
           "Manipulate option bytes"},
         { "eeprom",		(cmd_handler) stm32lx_cmd_eeprom,
           "Manipulate EEPROM(NVM data) memory"},
-        { 0 },
+        { NULL, NULL, NULL },
 };
 
 enum {