diff --git a/src/http/content.cr b/src/http/content.cr
index 2f5040d7ba50..2c4be03cb32e 100644
--- a/src/http/content.cr
+++ b/src/http/content.cr
@@ -73,7 +73,7 @@ module HTTP
       @io.peek
     end
 
-    def skip(bytes_count) : Int32?
+    def skip(bytes_count) : Nil
       ensure_send_continue
       @io.skip(bytes_count)
     end
@@ -164,7 +164,7 @@ module HTTP
       peek
     end
 
-    def skip(bytes_count) : Int32?
+    def skip(bytes_count) : Nil
       ensure_send_continue
       if bytes_count <= @chunk_remaining
         @io.skip(bytes_count)
diff --git a/src/io/memory.cr b/src/io/memory.cr
index 2d3dbb5256ac..20e4ec0865c9 100644
--- a/src/io/memory.cr
+++ b/src/io/memory.cr
@@ -192,7 +192,7 @@ class IO::Memory < IO
   end
 
   # :nodoc:
-  def skip(bytes_count)
+  def skip(bytes_count) : Nil
     check_open
 
     available = @bytesize - @pos