diff --git a/operand-func.go b/operand-func.go
index b4eaf7f..e92ec3a 100644
--- a/operand-func.go
+++ b/operand-func.go
@@ -25,14 +25,10 @@ func newFuncCallTerm(tk *Token, args []*term) *term {
 func checkFunctionCall(ctx ExprContext, name string, params []any) (err error) {
 	if info, exists, owner := GetFuncInfo(ctx, name); exists {
 		if info.MinArgs() > len(params) {
-			if info.MaxArgs() < 0 {
-				err = fmt.Errorf("too few params -- expected %d or more, got %d", info.MinArgs(), len(params))
-			} else {
-				err = fmt.Errorf("too few params -- expected %d, got %d", info.MinArgs(), len(params))
-			}
+			err = errTooFewParams(info.MinArgs(), info.MaxArgs(), len(params))
 		}
 		if err == nil && info.MaxArgs() >= 0 && info.MaxArgs() < len(params) {
-			err = fmt.Errorf("too much params -- expected %d, got %d", info.MaxArgs(), len(params))
+			err = errTooMuchParams(info.MaxArgs(), len(params))
 		}
 		if err == nil && owner != ctx {
 			ctx.RegisterFunc(name, info.Functor(), info.MinArgs(), info.MaxArgs())