diff --git a/src/data_uri.jl b/src/data_uri.jl
index 3a7aaad..bb38b4f 100644
--- a/src/data_uri.jl
+++ b/src/data_uri.jl
@@ -14,20 +14,21 @@ supported keyword arguments, or from a string.
 """
 struct DataURI
     uri::String
-    mediatype::MIME
+    mediatype::DataType
     isbase64::Bool
     data::SubString{String}
     parameters::Vector{Pair{String, String}}
     
 end
 
-function DataURI(; mediatype=MIME("text/plain"), encoded=false, data="", parameters=Pair{String, String}[])
+function DataURI(; mediatype=MIME"text/plain", encoded=false, data="", parameters=Pair{String, String}[])
     base64 = encoded ? ";base64" : ""
     s_parameters = ""
     for (key, value) in parameters
         s_parameters *= ";$(key)=$(value)"
-    end    
-    uri = "data:$(mediatype)$(s_parameters)$(base64),$(data)"
+    end
+    s_mediatype = string(mediatype.parameters[1])
+    uri = "data:$(s_mediatype)$(s_parameters)$(base64),$(data)"
     DataURI(uri, mediatype, encoded, data, parameters)
 end
 
@@ -36,7 +37,7 @@ function DataURI(str)
     if !isnothing(m)
         groups = m.captures
         mediatype, parameters, data = groups
-        mime = MIME(mediatype)
+        mime = MIME{Symbol(mediatype)}
         isbase64 = endswith(parameters, "base64")
         _parameters = filter(p -> p != "base64", split(parameters, ";"))
         parameters = Pair{String, String}[]
@@ -47,7 +48,7 @@ function DataURI(str)
     else
         m = match(DATA_URI_PATTERNS[2], str)
         data, = m.captures
-        mime = MIME("")
+        mime = MIME""
         isbase64 = false
         parameters = Pair{String, String}[]
     end
diff --git a/test/data_uri.jl b/test/data_uri.jl
index a42f7ee..711aff0 100644
--- a/test/data_uri.jl
+++ b/test/data_uri.jl
@@ -9,14 +9,14 @@ const brief_note = "data:,A%20brief%20note"
     @testset "parsing" begin
         @testset "larry" begin
             data_uri = DataURI(larry)
-            @test data_uri.mediatype == MIME("image/gif")
+            @test data_uri.mediatype == MIME"image/gif"
             @test data_uri.isbase64
             @test length(data_uri.parameters) == 0
         end
 
         @testset "greek_characters" begin
             data_uri = DataURI(greek_characters)
-            @test data_uri.mediatype == MIME("text/plain")
+            @test data_uri.mediatype == MIME"text/plain"
             @test !data_uri.isbase64
             @test getdata(data_uri) == "%be%fg%be"
             @test length(data_uri.parameters) == 1
@@ -26,7 +26,7 @@ const brief_note = "data:,A%20brief%20note"
 
         @testset "brief_note" begin
             data_uri = DataURI(brief_note)
-            @test data_uri.mediatype == MIME("")
+            @test data_uri.mediatype == MIME""
             @test !data_uri.isbase64
             @test getdata(data_uri) == "A%20brief%20note"
             @test length(data_uri.parameters) == 0
@@ -36,7 +36,7 @@ const brief_note = "data:,A%20brief%20note"
             open("resources/sample_data_uri/img_pluto.txt") do f
                 content = read(f, String)
                 data_uri = DataURI(content)
-                @test data_uri.mediatype == MIME("image/jpeg")
+                @test data_uri.mediatype == MIME"image/jpeg"
                 @test data_uri.isbase64
                 @test length(data_uri.parameters) == 0    
             end
@@ -46,7 +46,7 @@ const brief_note = "data:,A%20brief%20note"
             open("resources/sample_data_uri/audio_meow.txt") do f
                 content = read(f, String)
                 data_uri = DataURI(content)
-                @test data_uri.mediatype == MIME("audio/mpeg")
+                @test data_uri.mediatype == MIME"audio/mpeg"
                 @test data_uri.isbase64
                 @test length(data_uri.parameters) == 0    
             end
@@ -55,12 +55,12 @@ const brief_note = "data:,A%20brief%20note"
 
     @testset "creating" begin
         @testset "larry" begin
-            data_uri = DataURI(; mediatype=MIME("image/gif"), encoded=true, data="R0lGODdhMAAwAPAAAAAAAP///ywAAAAAMAAwAAAC8IyPqcvt3wCcDkiLc7C0qwyGHhSWpjQu5yqmCYsapyuvUUlvONmOZtfzgFzByTB10QgxOR0TqBQejhRNzOfkVJ+5YiUqrXF5Y5lKh/DeuNcP5yLWGsEbtLiOSpa/TPg7JpJHxyendzWTBfX0cxOnKPjgBzi4diinWGdkF8kjdfnycQZXZeYGejmJlZeGl9i2icVqaNVailT6F5iJ90m6mvuTS4OK05M0vDk0Q4XUtwvKOzrcd3iq9uisF81M1OIcR7lEewwcLp7tuNNkM3uNna3F2JQFo97Vriy/Xl4/f1cf5VWzXyym7PHhhx4dbgYKAAA7")
+            data_uri = DataURI(; mediatype=MIME"image/gif", encoded=true, data="R0lGODdhMAAwAPAAAAAAAP///ywAAAAAMAAwAAAC8IyPqcvt3wCcDkiLc7C0qwyGHhSWpjQu5yqmCYsapyuvUUlvONmOZtfzgFzByTB10QgxOR0TqBQejhRNzOfkVJ+5YiUqrXF5Y5lKh/DeuNcP5yLWGsEbtLiOSpa/TPg7JpJHxyendzWTBfX0cxOnKPjgBzi4diinWGdkF8kjdfnycQZXZeYGejmJlZeGl9i2icVqaNVailT6F5iJ90m6mvuTS4OK05M0vDk0Q4XUtwvKOzrcd3iq9uisF81M1OIcR7lEewwcLp7tuNNkM3uNna3F2JQFo97Vriy/Xl4/f1cf5VWzXyym7PHhhx4dbgYKAAA7")
             @test data_uri.uri == larry
         end
 
         @testset "greek_characters" begin
-            data_uri = DataURI(; mediatype=MIME("text/plain"), data="%be%fg%be", parameters=["charset" => "iso-8859-7"])
+            data_uri = DataURI(; mediatype=MIME"text/plain", data="%be%fg%be", parameters=["charset" => "iso-8859-7"])
             @test data_uri.uri == greek_characters
         end
 
@@ -70,7 +70,7 @@ const brief_note = "data:,A%20brief%20note"
         end
 
         @testset "brief_note" begin
-            data_uri = DataURI(; mediatype=MIME(""), data="A%20brief%20note")
+            data_uri = DataURI(; mediatype=MIME"", data="A%20brief%20note")
             @test data_uri.uri == brief_note
         end
     end