diff --git a/libs/main/core/pistring.cpp b/libs/main/core/pistring.cpp
index 8ac3c188..c1cc5212 100644
--- a/libs/main/core/pistring.cpp
+++ b/libs/main/core/pistring.cpp
@@ -200,19 +200,20 @@ llong PIString::toNumberBase(const PIString & value, int base, bool * ok) {
 
 void PIString::appendFromChars(const char * c, int s, const char * codepage) {
 	if (s <= 0) return;
+	int old_sz = size_s();
 	int sz;
 #ifdef PIP_ICU
 	UErrorCode e((UErrorCode)0);
 	UConverter * cc = ucnv_open(codepage, &e);
 	if (cc) {
-		resize(s);
+		enlarge(s);
 //		UChar * ucs = new UChar[s];
 //		memset(ucs, 0, s * sizeof(UChar));
 		e = (UErrorCode)0;
-		sz = ucnv_toUChars(cc, (UChar*)(PIDeque<PIChar>::data()), s, c, s, &e);
+		sz = ucnv_toUChars(cc, (UChar*)(PIDeque<PIChar>::data(old_sz)), s, c, s, &e);
 		//printf("appendFromChars %d -> %d\n", s, sz);
 		//printf("PIString %d -> %d\n", c[0], ucs[0]);
-		resize(sz);
+		resize(sz+sz);
 //		for (int i = 0; i < sz; ++i) {
 //			push_back(PIChar((ushort)ucs[i]));
 //		}
@@ -224,7 +225,6 @@ void PIString::appendFromChars(const char * c, int s, const char * codepage) {
 #  ifdef WINDOWS
 	sz = MultiByteToWideChar((uint)(uintptr_t)codepage, MB_ERR_INVALID_CHARS, c, s, 0, 0);
 	if (sz <= 0) return;
-	int old_sz = size_s();
 	enlarge(sz);
 	MultiByteToWideChar((uint)(uintptr_t)codepage, MB_ERR_INVALID_CHARS, c, s, (LPWSTR)PIDeque<PIChar>::data(old_sz), sz);
 	return;
@@ -235,8 +235,8 @@ void PIString::appendFromChars(const char * c, int s, const char * codepage) {
 	size_t len = mbsrtowcs(NULL, &c, 0, &state);
 	wchar_t wstr[len+1];
 	mbsrtowcs(&wstr[0], &c, len+1, &state);
-	resize(len);
-	for (int i=0; i<len; ++i) (*this)[i] = wstr[i];
+	enlarge(len);
+	for (size_t i=0; i<len; ++i) (*this)[old_sz+i] = wstr[i];
 //	//qDebug() << "FromChars done" << size();
 #  endif
 #endif