diff --git a/test/iobuffer.jl b/test/iobuffer.jl
index 933662f7e41d1..a9d58f4b7871e 100644
--- a/test/iobuffer.jl
+++ b/test/iobuffer.jl
@@ -399,3 +399,9 @@ end
     io = IOBuffer(data)
     @test read(io) == data
 end
+
+@testset "Writing Char to full buffer" begin
+    io = IOBuffer(;maxsize=1)
+    write(io, 'a')
+    @test write(io, 'a') == 0
+end