diff --git a/libs/main/io_devices/pibinarylog.cpp b/libs/main/io_devices/pibinarylog.cpp
index 0e337ca2..3de9e07b 100644
--- a/libs/main/io_devices/pibinarylog.cpp
+++ b/libs/main/io_devices/pibinarylog.cpp
@@ -728,7 +728,7 @@ bool PIBinaryLog::seek(llong filepos) {
 
 PIString PIBinaryLog::constructFullPathDevice() const {
 	PIString ret;
-	ret += logDir() + ":" + filePrefix() + ":" + defaultID() + ":";
+	ret += logDir() + ":" + filePrefix() + ":" + PIString::fromNumber(defaultID()) + ":";
 	switch (play_mode) {
 	case PlayRealTime:
 		ret += "RT";