diff --git a/compiler/sempass2.nim b/compiler/sempass2.nim
index d3b9349257..a964f2f6fd 100644
--- a/compiler/sempass2.nim
+++ b/compiler/sempass2.nim
@@ -176,7 +176,7 @@ proc shouldWarnRangeConversion(conf: ConfigRef; formalType, argType: PType): boo
   if f.kind == tyRange:
     # Only warn if formal range doesn't fully contain argument range
     # Check if the ranges don't perfectly overlap
-    if f.sym != nil and (f.sym.name.s == "Positive" or
+    if a.kind == tyInt and f.sym != nil and (f.sym.name.s == "Positive" or
           f.sym.name.s == "Natural"):
       # Positive and Natural are special cases that we never warn on
       result = false