diff --git a/SleepLib/loader_plugins/prs1_loader.cpp b/SleepLib/loader_plugins/prs1_loader.cpp
index d7f102c..61f2d34 100644
--- a/SleepLib/loader_plugins/prs1_loader.cpp
+++ b/SleepLib/loader_plugins/prs1_loader.cpp
@@ -597,7 +597,7 @@ bool PRS1Loader::Parse002v5(qint32 sequence, quint32 timestamp, unsigned char *b
         CPAP_LeakTotal, PRS1_12
     };
 
-    int ncodes=sizeof(Codes)/sizeof(QString);
+    int ncodes=sizeof(Codes)/sizeof(ChannelID);
     EventList * Code[0x20]={NULL};