diff --git a/src/lib.c b/src/lib.c
index 5f9540e..bc6243c 100644
--- a/src/lib.c
+++ b/src/lib.c
@@ -13,7 +13,7 @@ inline int _strnlen(const char *s, int maxlen) {
 	while (s[len] != 0 && len < maxlen) len++;
 	return len;
 }
-inline char _strncpy(char *dest, const char *src, int n) {
+inline int _strncpy(char *dest, const char *src, int n) {
 	int i = 0;
 	while (i < n && src[i] != '\0') {
 		dest[i] = src[i];
@@ -23,7 +23,7 @@ inline char _strncpy(char *dest, const char *src, int n) {
 		dest[i] = '\0';
 		i++;
 	}
-	return dest;
+	return i;
 }
 uint16_t crc16_ccitt(char* data, uint16_t len) {
 	uint16_t i, crc=0xFFFF;
diff --git a/src/lib.h b/src/lib.h
index ccca945..785c1df 100644
--- a/src/lib.h
+++ b/src/lib.h
@@ -6,7 +6,7 @@
 void msleep(unsigned long ms);
 
 int _strnlen(const char *s, int maxlen);
-char _strncpy(char *dest, const char *src, int n);
+int _strncpy(char *dest, const char *src, int n);
 
 uint16_t crc16_ccitt(char *data, uint16_t len);