diff --git a/sources/io.F90 b/sources/io.F90
index 0e4b900..086df8b 100644
--- a/sources/io.F90
+++ b/sources/io.F90
@@ -347,7 +347,7 @@ module io
 
 ! check the last available restart snapshot
 !
-    if (nrest < 0) then
+    if (nrest == 0) then
 
       test = .true.
       nrest = 0