diff --git a/tests/system/tostring.nim b/tests/system/tostring.nim
index ea4a44417f3d3..4ff363075c676 100644
--- a/tests/system/tostring.nim
+++ b/tests/system/tostring.nim
@@ -83,9 +83,9 @@ proc stringCompare() =
   doAssert b == "bee"
   b.add g
   doAssert b == "bee"
-  c.add 123.456
+  c.addFloat 123.456
   doAssert c == "123.456"
-  d.add 123456
+  d.addInt 123456
   doAssert d == "123456"
 
   doAssert e == ""