diff --git a/scilab/modules/linear_algebra/sci_gateway/cpp/sci_schur.cpp b/scilab/modules/linear_algebra/sci_gateway/cpp/sci_schur.cpp
index 29129696623..02f9cb9d4d4 100644
--- a/scilab/modules/linear_algebra/sci_gateway/cpp/sci_schur.cpp
+++ b/scilab/modules/linear_algebra/sci_gateway/cpp/sci_schur.cpp
@@ -183,7 +183,7 @@ types::Function::ReturnValue sci_schur(types::typed_list &in, int _iRetCount, ty
         }
         case 12: // double string
         {
-            if (_iRetCount < 2 && _iRetCount > 3)
+            if (_iRetCount >= 2 && _iRetCount <= 3)
             {
                 Scierror(78, _("%s: Wrong number of output argument(s): %d to %d expected.\n"), "schur", 2, 3);
                 return types::Function::Error;