1 files changed, 1 insertions, 1 deletions
diff --git a/impl.bqn b/impl.bqn
index 6efef2c6..83a70461 100644
--- a/impl.bqn
+++ b/impl.bqn
@@ -303,7 +303,7 @@ Pick←IsArray◶⥊‿⊢⊸Pickd
 IndexOf←{
   c←1-˜=𝕨
   ! 0≤c
-  𝕨 (0<≠𝕨)◶⟨0⎉c∘⊢,(+˝∧`)≢⎉c⎉c‿∞⟩ 𝕩
+  𝕨 (0<≠𝕨)◶⟨0⎉c∘⊢,(+˝∧`)≢⌜○((0<c)◶⟨⊢,<⎉c⟩)⟩ 𝕩
 }
 UniqueMask←{
   ! 1≤=𝕩