diff --git a/src/IO.f90 b/src/IO.f90
index 96c07e8fe..4a02cd267 100644
--- a/src/IO.f90
+++ b/src/IO.f90
@@ -1461,7 +1461,7 @@ subroutine IO_error(error_ID,el,ip,g,instance,ext_msg)
  case (144_pInt)
    msg = 'negative number of systems'
  case (145_pInt)
-   msg = 'to many systems requested'
+   msg = 'too many systems requested'
 
 !--------------------------------------------------------------------------------------------------
 ! material error messages and related messages in mesh