diff --git a/changelog.d/1188.breaking.md b/changelog.d/1188.breaking.md
index 6c5df8c13..f5d65b4cb 100644
--- a/changelog.d/1188.breaking.md
+++ b/changelog.d/1188.breaking.md
@@ -1 +1,3 @@
 Removed deprecated `ellipsis` argument from the `truncate` function. Use `suffix` instead.
+
+authors: pront
\ No newline at end of file
diff --git a/changelog.d/1246.breaking.md b/changelog.d/1246.breaking.md
new file mode 100644
index 000000000..3ae3badc0
--- /dev/null
+++ b/changelog.d/1246.breaking.md
@@ -0,0 +1,2 @@
+Fix `slice` type_def. This is a breaking change because it might change the fallibility of the `slice` function and this VRL scripts will
+need to be updated accordingly.
\ No newline at end of file
diff --git a/lib/tests/tests/internal/unknown_typedef_undefined.vrl b/lib/tests/tests/internal/unknown_typedef_undefined.vrl
index 8f0152336..c9802c5e9 100644
--- a/lib/tests/tests/internal/unknown_typedef_undefined.vrl
+++ b/lib/tests/tests/internal/unknown_typedef_undefined.vrl
@@ -1,5 +1,5 @@
 # result:
-# { "integer": true, "undefined": true }
+# { "undefined": true }
 
 x = slice!([0], 0)
 type_def(x[1])