diff --git a/ext/webp_ffi/Rakefile b/ext/webp_ffi/Rakefile
index 7db4859..22e2e98 100644
--- a/ext/webp_ffi/Rakefile
+++ b/ext/webp_ffi/Rakefile
@@ -14,11 +14,6 @@ FFI::Compiler::CompileTask.new('webp_ffi') do |c|
   c.have_library?('png')
   c.have_library?('jpeg')
   c.have_library?('tiff')
-  # compiler flags
-  if c.platform.mac?
-    c.cflags << "-arch x86_64"
-    c.ldflags << "-arch x86_64"
-  end
   c.ldflags << ENV['LD_FLAGS'] if ENV['LD_FLAGS']
   c.cflags << ENV['C_FLAGS'] if ENV['C_FLAGS']
 end
diff --git a/lib/webp/version.rb b/lib/webp/version.rb
index efb34be..1df1697 100644
--- a/lib/webp/version.rb
+++ b/lib/webp/version.rb
@@ -1,3 +1,3 @@
 module WebP
-  VERSION = "0.3.0"
+  VERSION = "0.3.1"
 end