diff --git a/card-tools.js b/card-tools.js
index a608749..12620d2 100644
--- a/card-tools.js
+++ b/card-tools.js
@@ -300,7 +300,7 @@ class {
       const lhs = this.parseTemplateString(str[1]);
       const rhs = this.parseTemplateString(str[3]);
       var expr = ''
-      if(!parseFloat(lhs))
+      if(parseFloat(lhs) != lhs)
         expr = `"${lhs}" ${str[2]} "${rhs}"`;
       else
         expr = `${parseFloat(lhs)} ${str[2]} ${parseFloat(rhs)}`