diff --git a/src/builder.hpp b/src/builder.hpp
index 92b854a..55b6e07 100644
--- a/src/builder.hpp
+++ b/src/builder.hpp
@@ -79,8 +79,8 @@ public:
 
     void push(uint16_t v)
     {
-        m_data[m_ip] = v >> 8;
-        m_data[m_ip + 1] = v & 0xff;
+        m_data[m_ip] = v & 0xff;
+        m_data[m_ip + 1] = v >> 8;
         m_ip += 2;
     }
 
diff --git a/src/vm.cpp b/src/vm.cpp
index 755087d..437a662 100644
--- a/src/vm.cpp
+++ b/src/vm.cpp
@@ -145,8 +145,8 @@ uint16_t VM::word(uint16_t addr) const
     }
 
     uint16_t value = 0;
-    value |= static_cast<uint16_t>(m_mem[addr]) << 8;
-    value |= m_mem[addr + 1];
+    value |= m_mem[addr];
+    value |= static_cast<uint16_t>(m_mem[addr + 1]) << 8;
     return value;
 }
 
@@ -167,8 +167,8 @@ void VM::set_word(uint16_t addr, uint16_t value)
             std::format("invalid address alignment, addr = {}", addr));
     }
 
-    m_mem[addr] = value >> 8;
-    m_mem[addr + 1] = value & 0xff;
+    m_mem[addr] = value & 0xff;
+    m_mem[addr + 1] = value >> 8;
 }
 
 void VM::set_byte(uint16_t addr, uint8_t value)