Index: ext/async/sqlite3async.c
==================================================================
--- ext/async/sqlite3async.c
+++ ext/async/sqlite3async.c
@@ -1229,12 +1229,12 @@
   ** needs to return a canonical path. The following block assumes the
   ** file-system uses unix style paths. 
   */
   if( rc==SQLITE_OK ){
     int i, j;
-    int n = nPathOut;
     char *z = zPathOut;
+    int n = strlen(z);
     while( n>1 && z[n-1]=='/' ){ n--; }
     for(i=j=0; i<n; i++){
       if( z[i]=='/' ){
         if( z[i+1]=='/' ) continue;
         if( z[i+1]=='.' && i+2<n && z[i+2]=='/' ){