diff --git a/.changeset/twenty-rocks-lie.md b/.changeset/twenty-rocks-lie.md
new file mode 100644
index 0000000000..0fae66a4c4
--- /dev/null
+++ b/.changeset/twenty-rocks-lie.md
@@ -0,0 +1,5 @@
+---
+"@quri/squiggle-lang": patch
+---
+
+Bug fix: frWithTags should work for 0 value
diff --git a/packages/squiggle-lang/__tests__/library/tag_test.ts b/packages/squiggle-lang/__tests__/library/tag_test.ts
index 3bc210d164..e4640ca5ce 100644
--- a/packages/squiggle-lang/__tests__/library/tag_test.ts
+++ b/packages/squiggle-lang/__tests__/library/tag_test.ts
@@ -18,6 +18,7 @@ describe("Tags", () => {
 
   describe("format", () => {
     testEvalToBe("123 -> Tag.format('.2%') -> Tag.getFormat", '".2%"');
+    testEvalToBe("0 -> Tag.format('.2%') -> Tag.getFormat", '".2%"');
   });
 
   describe("notebook", () => {
diff --git a/packages/squiggle-lang/src/library/registry/frTypes.ts b/packages/squiggle-lang/src/library/registry/frTypes.ts
index ca37858a76..3aee449373 100644
--- a/packages/squiggle-lang/src/library/registry/frTypes.ts
+++ b/packages/squiggle-lang/src/library/registry/frTypes.ts
@@ -174,7 +174,7 @@ export const frWithTags = <T>(
     unpack: (v) => {
       const unpackedItem = itemType.unpack(v);
       return (
-        (unpackedItem && {
+        (unpackedItem !== undefined && {
           value: unpackedItem,
           tags: v.tags ?? new ValueTags({}),
         }) ||