1 files changed, 2 insertions, 1 deletions
diff --git a/src/os_unix.c b/src/os_unix.c
index a688ed270..e3cfe35cd 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -6361,7 +6361,8 @@ static int unixBackupDir(const char *z, int *pJ){
   int j = *pJ;
   int i;
   if( j<=0 ) return 0;
-  for(i=j-1; ALWAYS(i>0) && z[i-1]!='/'; i--){}
+  for(i=j-1; i>0 && z[i-1]!='/'; i--){}
+  if( i==0 ) return 0;
   if( z[i]=='.' && i==j-2 && z[i+1]=='.' ) return 0;
   *pJ = i-1;
   return 1;