diff --git a/include/transform.hpp b/include/transform.hpp
index f0a4624..56c9578 100644
--- a/include/transform.hpp
+++ b/include/transform.hpp
@@ -151,7 +151,7 @@ namespace vm
 
         inline bool valid( zydis_mnemonic_t op )
         {
-            return transforms< std::uint8_t >.find( op ) != transforms< std::uint8_t >.end();
+            return transforms< std::uint64_t >.find( op ) != transforms< std::uint64_t >.end();
         }
 
         inline void inverse_transforms( transform::map_t &transforms, transform::map_t &inverse )
diff --git a/src/vminstrs.cpp b/src/vminstrs.cpp
index ace5985..58f0b6f 100644
--- a/src/vminstrs.cpp
+++ b/src/vminstrs.cpp
@@ -144,7 +144,7 @@ namespace vm
             {
                 result = std::find_if( ++result, vm_entry.end(), []( const zydis_instr_t &instr_data ) -> bool {
                     return vm::transform::valid( instr_data.instr.mnemonic ) &&
-                           instr_data.instr.operands[ 0 ].actions == ZYDIS_OPERAND_ACTION_WRITE &&
+                           instr_data.instr.operands[ 0 ].actions & ZYDIS_OPERAND_ACTION_WRITE &&
                            instr_data.instr.operands[ 0 ].reg.value == ZYDIS_REGISTER_ESI;
                 } );