diff --git a/gatchat/gatutil.c b/gatchat/gatutil.c
index a2528e13..ea433bcb 100644
--- a/gatchat/gatutil.c
+++ b/gatchat/gatutil.c
@@ -67,8 +67,7 @@ void g_at_util_debug_chat(gboolean in, const char *str, gsize len,
 
 	escaped_str[0] = type;
 	escaped_str[1] = ' ';
-	escaped_str[2] = '\0';
-	escaped_str[escaped] = '\0';
+	memset(escaped_str + 2, '\0', escaped - 2);
 
 	for (escaped = 2, i = 0; i < len; i++) {
 		unsigned char c = str[i];
@@ -87,11 +86,11 @@ void g_at_util_debug_chat(gboolean in, const char *str, gsize len,
 			escaped_str[escaped++] = 'n';
 			break;
 		case 26:
-			strncpy(&escaped_str[escaped], ctrlz, ctrlz_size);
+			memcpy(escaped_str + escaped, ctrlz, ctrlz_size);
 			escaped += ctrlz_size;
 			break;
 		case 25:
-			strncpy(&escaped_str[escaped], esc, esc_size);
+			memcpy(escaped_str + escaped, esc, esc_size);
 			escaped += esc_size;
 			break;
 		default: