diff --git a/src/backend_x64/block_of_code.cpp b/src/backend_x64/block_of_code.cpp
index 1e0eaa16..d4a059b6 100644
--- a/src/backend_x64/block_of_code.cpp
+++ b/src/backend_x64/block_of_code.cpp
@@ -139,6 +139,45 @@ void BlockOfCode::CallFunction(const void* fn) {
     }
 }
 
+void BlockOfCode::nop(size_t size) {
+    switch (size) {
+    case 0:
+        return;
+    case 1:
+        db(0x90);
+        return;
+    case 2:
+        db(0x66); db(0x90);
+        return;
+    case 3:
+        db(0x0f); db(0x1f); db(0x00);
+        return;
+    case 4:
+        db(0x0f); db(0x1f); db(0x40); db(0x00);
+        return;
+    case 5:
+        db(0x0f); db(0x1f); db(0x44); db(0x00); db(0x00);
+        return;
+    case 6:
+        db(0x66); db(0x0f); db(0x1f); db(0x44); db(0x00); db(0x00);
+        return;
+    case 7:
+        db(0x0f); db(0x1f); db(0x80); db(0x00); db(0x00); db(0x00); db(0x00);
+        return;
+    case 8:
+        db(0x0f); db(0x1f); db(0x84); db(0x00); db(0x00); db(0x00); db(0x00); db(0x00);
+        return;
+    case 9:
+        db(0x66); db(0x0f); db(0x1f); db(0x84); db(0x00); db(0x00); db(0x00); db(0x00); db(0x00);
+        return;
+    case 10:
+    default:
+        db(0x66); db(0x2e); db(0x0f); db(0x1f); db(0x84); db(0x00); db(0x00); db(0x00); db(0x00); db(0x00);
+        nop(size - 10);
+        return;
+    }
+}
+
 void BlockOfCode::SetCodePtr(CodePtr ptr) {
     // The "size" defines where top_, the insertion point, is.
     size_t required_size = reinterpret_cast<const u8*>(ptr) - getCode();
diff --git a/src/backend_x64/block_of_code.h b/src/backend_x64/block_of_code.h
index f15df9bb..20f2ce2a 100644
--- a/src/backend_x64/block_of_code.h
+++ b/src/backend_x64/block_of_code.h
@@ -80,11 +80,7 @@ public:
     }
 
     void int3() { db(0xCC); }
-    void nop(size_t size = 0) {
-        for (size_t i = 0; i < size; i++) {
-            db(0x90);
-        }
-    }
+    void nop(size_t size = 0);
 
     void SetCodePtr(CodePtr ptr);
     void EnsurePatchLocationSize(CodePtr begin, size_t size);