diff --git a/lib/onewire_master.c b/lib/onewire_master.c
index 88951d5..e307091 100644
--- a/lib/onewire_master.c
+++ b/lib/onewire_master.c
@@ -306,6 +306,7 @@ bool onewire_master_rom_search(uint64_t* code, bool alarm)
 {
 	static uint8_t conflict_last = 64; // on which bit has the conflict been detected (64 means there hasn't been)
 	uint8_t conflict_current = 64; // to remember on which bit the last unknown conflict has been detected
+	uint8_t bits[1] = {0}; // small buffer to store the bits used to search the ROM codes
 
 	// send SEARCH ROM command
 	uint8_t command = 0xf0; // SEARCH ROM command
@@ -320,7 +321,7 @@ bool onewire_master_rom_search(uint64_t* code, bool alarm)
 		*code = 0; // restart search codes
 	}
 
-	buffer = (uint8_t*){0}; // buffer to read up to two bits
+	buffer = bits; // buffer to read up to two bits
 	for (uint8_t bit=0; bit<64; bit++) { // go through all 64 bits ROM code
 		buffer_size = 2; // read two first bits to detect conflict
 		if (!onewire_master_read()) { // read ROM ID from slave