diff --git a/src/util/string.c b/src/util/string.c
index 08e4a4292..0157d4403 100644
--- a/src/util/string.c
+++ b/src/util/string.c
@@ -187,12 +187,11 @@ char* utf16to8(const uint16_t* utf16, size_t length) {
 			memcpy(utf8, buffer, bytes);
 			offset = utf8 + bytes;
 		} else if (utf8Length >= utf8TotalBytes) {
+			ptrdiff_t o = offset - utf8;
 			char* newUTF8 = realloc(utf8, utf8TotalBytes * 2);
-			offset = offset - utf8 + newUTF8;
-			if (newUTF8 != utf8) {
-				free(utf8);
-			}
+			offset = o + newUTF8;
 			if (!newUTF8) {
+				free(utf8);
 				return 0;
 			}
 			utf8 = newUTF8;