diff --git a/src/OnlineStatsBase.jl b/src/OnlineStatsBase.jl
index 807e6a4..61f51d0 100644
--- a/src/OnlineStatsBase.jl
+++ b/src/OnlineStatsBase.jl
@@ -118,7 +118,7 @@ end
 fit!(o::OnlineStat{T}, yi::T) where {T} = (_fit!(o, yi); return o)
 
 function fit!(o::OnlineStat{I}, y::T) where {I, T}
-    T == eltype(y) && error("The input for $(name(o,false,false)) is a $I.  Found $T.")
+    T == eltype(y) && error("The input for $(name(o,false,false)) is $I.  Found $T.")
     for yi in y
         fit!(o, yi)
     end