diff --git a/CMakeLists.txt b/CMakeLists.txt
index 39c0e789..83a23a28 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,7 @@ cmake_policy(SET CMP0017 NEW) # need include() with .cmake
 project(PIP)
 set(PIP_MAJOR    3)
 set(PIP_MINOR    10)
-set(PIP_REVISION 0)
+set(PIP_REVISION 1)
 set(PIP_SUFFIX   )
 set(PIP_COMPANY  SHS)
 set(PIP_DOMAIN   org.SHS)
diff --git a/libs/main/io_devices/piiostring.cpp b/libs/main/io_devices/piiostring.cpp
index b6886213..2cec7c73 100644
--- a/libs/main/io_devices/piiostring.cpp
+++ b/libs/main/io_devices/piiostring.cpp
@@ -81,7 +81,7 @@ ssize_t PIIOString::writeDevice(const void * data, ssize_t max_size) {
 	if (!canWrite() || !str) return -1;
 	// piCout << "write" << data;
 	if (pos > str->size_s()) pos = str->size_s();
-	PIString rs = PIString::fromUTF8((const char *)data);
+	PIString rs = PIString::fromUTF8((const char *)data, max_size);
 	if (rs.size_s() > max_size) rs.resize(max_size);
 	str->insert(pos, rs);
 	pos += rs.size_s();
diff --git a/libs/main/text/pistring.cpp b/libs/main/text/pistring.cpp
index 9897d5c9..715c50df 100644
--- a/libs/main/text/pistring.cpp
+++ b/libs/main/text/pistring.cpp
@@ -356,15 +356,16 @@ PIString PIString::fromSystem(const char * s) {
 }
 
 
-PIString PIString::fromUTF8(const char * s) {
+PIString PIString::fromUTF8(const char * s, int l) {
 	PIString ret;
 	if (!s) return ret;
 	if (s[0] != '\0') {
 		if ((uchar)s[0] == 0xEF && (uchar)s[1] == 0xBB && (uchar)s[2] == 0xBF) {
 			s += 3;
+			if (l > 0) l -= 3;
 			if (s[0] == '\0') return ret;
 		}
-		ret.appendFromChars(s, -1, __utf8name__);
+		ret.appendFromChars(s, l, __utf8name__);
 	}
 	return ret;
 }
diff --git a/libs/main/text/pistring.h b/libs/main/text/pistring.h
index d8f34576..2a3f7d28 100644
--- a/libs/main/text/pistring.h
+++ b/libs/main/text/pistring.h
@@ -1700,7 +1700,7 @@ public:
 
 	//! \~english Returns string constructed from UTF-8.
 	//! \~russian Возвращает строку созданную из UTF-8.
-	static PIString fromUTF8(const char * s);
+	static PIString fromUTF8(const char * s, int l = -1);
 
 	//! \~english Returns string constructed from UTF-8.
 	//! \~russian Возвращает строку созданную из UTF-8.