diff --git a/src/frontend/A64/decoder/a64.inc b/src/frontend/A64/decoder/a64.inc
index 8013a2a6..19b4e123 100644
--- a/src/frontend/A64/decoder/a64.inc
+++ b/src/frontend/A64/decoder/a64.inc
@@ -639,7 +639,7 @@ INST(NEG_2,                  "NEG (vector)",                              "0Q101
 //INST(UCVTF_int_4,            "UCVTF (vector, integer)",                   "0Q1011100z100001110110nnnnnddddd")
 INST(NOT,                    "NOT",                                       "0Q10111000100000010110nnnnnddddd")
 INST(RBIT_asimd,             "RBIT (vector)",                             "0Q10111001100000010110nnnnnddddd")
-//INST(FNEG_1,                 "FNEG (vector)",                             "0Q10111011111000111110nnnnnddddd")
+INST(FNEG_1,                 "FNEG (vector)",                             "0Q10111011111000111110nnnnnddddd")
 INST(FNEG_2,                 "FNEG (vector)",                             "0Q1011101z100000111110nnnnnddddd")
 //INST(FRINTI_1,               "FRINTI (vector)",                           "0Q10111011111001100110nnnnnddddd")
 //INST(FRINTI_2,               "FRINTI (vector)",                           "0Q1011101z100001100110nnnnnddddd")
diff --git a/src/frontend/A64/translate/impl/simd_two_register_misc.cpp b/src/frontend/A64/translate/impl/simd_two_register_misc.cpp
index ec329a1d..f5f03b89 100644
--- a/src/frontend/A64/translate/impl/simd_two_register_misc.cpp
+++ b/src/frontend/A64/translate/impl/simd_two_register_misc.cpp
@@ -114,6 +114,17 @@ bool TranslatorVisitor::XTN(bool Q, Imm<2> size, Vec Vn, Vec Vd) {
     return true;
 }
 
+bool TranslatorVisitor::FNEG_1(bool Q, Vec Vn, Vec Vd) {
+    const size_t datasize = Q ? 128 : 64;
+
+    const IR::U128 operand = V(datasize, Vn);
+    const IR::U128 mask = ir.VectorBroadcast(64, I(64, 0x8000800080008000));
+    const IR::U128 result = ir.VectorEor(operand, mask);
+
+    V(datasize, Vd, result);
+    return true;
+}
+
 bool TranslatorVisitor::FNEG_2(bool Q, bool sz, Vec Vn, Vec Vd) {
     if (sz && !Q) {
         return ReservedValue();