diff --git a/libs/main/core/pistring.cpp b/libs/main/core/pistring.cpp
index fd90b325..16e26151 100644
--- a/libs/main/core/pistring.cpp
+++ b/libs/main/core/pistring.cpp
@@ -221,7 +221,7 @@ void PIString::appendFromChars(const char * c, int s, const char * codepage) {
 #  else
 	std::wstring_convert<std::codecvt_utf8<char16_t>, char16_t> ucs2conv;
 	std::u16string ucs2 = ucs2conv.from_bytes(c, c+s);
-	enlarge(ucs2.size());
+	d.enlarge(ucs2.size());
 	ucs2.copy((char16_t *)d.data(old_sz), ucs2.size());
 #  endif
 #endif