diff --git a/src/frontend/decoder/thumb1.h b/src/frontend/decoder/thumb1.h
index 248d6c3c..01057c87 100644
--- a/src/frontend/decoder/thumb1.h
+++ b/src/frontend/decoder/thumb1.h
@@ -56,7 +56,7 @@ private:
 };
 
 template <typename V>
-static const std::array<Thumb1Matcher<V>, 24> g_thumb1_instruction_table {{
+static const std::array<Thumb1Matcher<V>, 25> g_thumb1_instruction_table {{
 
 #define INST(fn, name, bitstring) detail::detail<Thumb1Matcher, u16, 16>::GetMatcher<decltype(fn), fn>(name, bitstring)
 
@@ -85,7 +85,7 @@ static const std::array<Thumb1Matcher<V>, 24> g_thumb1_instruction_table {{
     { INST(&V::thumb1_TST_reg,        "TST (reg)",                "0100001000mmmnnn") },
     { INST(&V::thumb1_RSB_imm,        "RSB (imm)",                "0100001001nnnddd") },
     { INST(&V::thumb1_CMP_reg,        "CMP (reg)",                "0100001010mmmnnn") },
-    //{ INST(&V::thumb1_CMN_rr,         "CMN (rr)",                 "0100001011mmmnnn") },
+    { INST(&V::thumb1_CMN_reg,        "CMN (reg)",                "0100001011mmmnnn") },
     //{ INST(&V::thumb1_ORRS_rr,        "ORRS (rr)",                "0100001100mmmddd") },
     //{ INST(&V::thumb1_MULS_rr,        "MULS (rr)",                "0100001101mmmddd") },
     //{ INST(&V::thumb1_BICS_rr,        "BICS (rr)",                "0100001110mmmddd") },
diff --git a/src/frontend/disassembler_thumb.cpp b/src/frontend/disassembler_thumb.cpp
index 632a89f4..325da510 100644
--- a/src/frontend/disassembler_thumb.cpp
+++ b/src/frontend/disassembler_thumb.cpp
@@ -191,6 +191,10 @@ public:
         return Common::StringFromFormat("cmp %s, %s", RegStr(n), RegStr(m));
     }
 
+    std::string thumb1_CMN_reg(Reg m, Reg n) {
+        return Common::StringFromFormat("cmn %s, %s", RegStr(n), RegStr(m));
+    }
+
     std::string thumb1_ADD_reg_t2(bool d_n_hi, Reg m, Reg d_n_lo) {
         Reg d_n = d_n_hi ? (d_n_lo + 8) : d_n_lo;
         return Common::StringFromFormat("add %s, %s", RegStr(d_n), RegStr(m));
diff --git a/src/frontend/translate_thumb.cpp b/src/frontend/translate_thumb.cpp
index 6cf9a3bf..13ec616d 100644
--- a/src/frontend/translate_thumb.cpp
+++ b/src/frontend/translate_thumb.cpp
@@ -278,6 +278,15 @@ struct TranslatorVisitor final {
         ir.SetVFlag(result.overflow);
         return true;
     }
+    bool thumb1_CMN_reg(Reg m, Reg n) {
+        // CMN <Rn>, <Rm>
+        auto result = ir.AddWithCarry(ir.GetRegister(n), ir.GetRegister(m), ir.Imm1(0));
+        ir.SetNFlag(ir.MostSignificantBit(result.result));
+        ir.SetZFlag(ir.IsZero(result.result));
+        ir.SetCFlag(result.carry);
+        ir.SetVFlag(result.overflow);
+        return true;
+    }
 
     bool thumb1_ADD_reg_t2(bool d_n_hi, Reg m, Reg d_n_lo) {
         Reg d_n = d_n_hi ? (d_n_lo + 8) : d_n_lo;