diff --git a/lib/ronin/asm/memory.rb b/lib/ronin/asm/memory.rb
index b7d0e270..1681128a 100644
--- a/lib/ronin/asm/memory.rb
+++ b/lib/ronin/asm/memory.rb
@@ -155,6 +155,17 @@ def mem32?
         @width == 4
       end
 
+      #
+      # Determines if the operand is a 64bit memory operand.
+      #
+      # @return [Boolean]
+      #
+      # @since 1.0.0
+      #
+      def mem64?
+        @width == 8
+      end
+
       #
       # Adds to the displacement of the Memory Operand.
       #
diff --git a/spec/memory_spec.rb b/spec/memory_spec.rb
index 1cb5d3c1..fb7932f1 100644
--- a/spec/memory_spec.rb
+++ b/spec/memory_spec.rb
@@ -185,6 +185,28 @@
     end
   end
 
+  describe "#mem64?" do
+    context "when the #width is 8" do
+      let(:width) { 8 }
+
+      subject { described_class.new(base: register, width: width) }
+
+      it "must return true" do
+        expect(subject.mem64?).to be(true)
+      end
+    end
+
+    context "when the #type is not 8" do
+      let(:width) { 1 }
+
+      subject { described_class.new(base: register, width: width) }
+
+      it "must return false" do
+        expect(subject.mem64?).to be(false)
+      end
+    end
+  end
+
   describe "#+" do
     let(:operand) do
       described_class.new(