diff --git a/src/reactor.cr b/src/reactor.cr
index e28244c5..541cda06 100644
--- a/src/reactor.cr
+++ b/src/reactor.cr
@@ -45,11 +45,14 @@ module Mint
           HTTP::CompressHandler.new,
           websocket_handler,
         ]) do |context|
+          path =
+            URI.decode(context.request.path)
+
           # Handle the request depending on the result.
           content_type, content =
-            if file = @files[context.request.path]?
+            if file = @files[path]?
               {
-                MIME.from_filename?(context.request.path).to_s || "text/plain",
+                MIME.from_filename?(path).to_s || "text/plain",
                 file.call,
               }
             else
diff --git a/src/test_runner.cr b/src/test_runner.cr
index c4517fc2..c2ba9d7e 100644
--- a/src/test_runner.cr
+++ b/src/test_runner.cr
@@ -97,14 +97,15 @@ module Mint
         end
 
       @server =
-        HTTP::Server.new([
-          websocket_handler,
-        ]) do |context|
+        HTTP::Server.new([websocket_handler]) do |context|
+          path =
+            URI.decode(context.request.path)
+
           # Handle the request depending on the result.
           content_type, content =
-            if file = @files[context.request.path]?
+            if file = @files[path]?
               {
-                MIME.from_filename?(context.request.path).to_s || "text/plain",
+                MIME.from_filename?(path).to_s || "text/plain",
                 file.call,
               }
             else