diff --git a/src/animation.jl b/src/animation.jl
index 4f9ff6da..f4db54be 100644
--- a/src/animation.jl
+++ b/src/animation.jl
@@ -103,6 +103,7 @@ function Base.show(io::IO, ::MIME"text/html", agif::AnimatedGif)
     else
         error("Cannot show animation with extension $ext: $agif")
     end)
+    return nothing
 end
 
 
diff --git a/src/output.jl b/src/output.jl
index 27c7731e..95a9c158 100644
--- a/src/output.jl
+++ b/src/output.jl
@@ -197,6 +197,7 @@ for mime in ("text/plain", "text/html", "image/png", "image/eps", "image/svg+xml
           prepare_output(plt)
           _show(io, m, plt)
         end
+        return nothing
     end
 end