diff --git a/moduleOutput.f90 b/moduleOutput.f90
index 7383d7b..1602bb0 100644
--- a/moduleOutput.f90
+++ b/moduleOutput.f90
@@ -14,7 +14,7 @@ module output
   integer, parameter:: dataPhi_id = 40
   integer, parameter:: dataCum_id = 50
   integer, parameter:: dataTime_id  = 60
-  character(len=*), parameter :: formatInt = 'I10'
+  character(len=*), parameter :: formatInt = 'I0'
   character(len=7), parameter:: formatFloat = 'ES0.6e3'
   character(len=3), parameter:: formatSep   = '","'
   character(len=7):: formatTime