diff --git a/MimeTypes.csproj b/MimeTypes.csproj
index 25813e4..befea38 100644
--- a/MimeTypes.csproj
+++ b/MimeTypes.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>net452;net48;netcoreapp2.2;netcoreapp3.1;netstandard2.0;</TargetFrameworks>
+    <TargetFrameworks>net45;net48;netcoreapp2.2;netstandard1.1;netcoreapp3.1;netstandard2.0;</TargetFrameworks>
     <PackageId>MimeTypeMapOfficial</PackageId>
     <Version>1.0.17</Version>
     <Authors>Samuel Neff</Authors>