diff --git a/src/selection.jl b/src/selection.jl
index 51ccd369..fe0625dc 100644
--- a/src/selection.jl
+++ b/src/selection.jl
@@ -197,7 +197,7 @@ which all conditions are true.
 """
 function Base.filter(fn, t::Dataset; select=valuenames(t))
     x = rows(t, select)
-    indxs = findall(map(fn, x))
+    indxs = findall(fn, x)
     subtable(t, indxs, presorted=true)
 end