diff --git a/src/frontend/A64/translate/impl/impl.cpp b/src/frontend/A64/translate/impl/impl.cpp
index 86ae2833..3f056fc9 100644
--- a/src/frontend/A64/translate/impl/impl.cpp
+++ b/src/frontend/A64/translate/impl/impl.cpp
@@ -116,8 +116,12 @@ u64 TranslatorVisitor::AdvSIMDExpandImm(bool op, Imm<4> cmode, Imm<8> imm8) {
     return 0;
 }
 
-IR::U32U64 TranslatorVisitor::I(size_t bitsize, u64 value) {
+IR::UAny TranslatorVisitor::I(size_t bitsize, u64 value) {
     switch (bitsize) {
+    case 8:
+        return ir.Imm8(static_cast<u8>(value));
+    case 16:
+        return ir.Imm16(static_cast<u16>(value));
     case 32:
         return ir.Imm32(static_cast<u32>(value));
     case 64:
diff --git a/src/frontend/A64/translate/impl/impl.h b/src/frontend/A64/translate/impl/impl.h
index 2a6295a6..7ed461aa 100644
--- a/src/frontend/A64/translate/impl/impl.h
+++ b/src/frontend/A64/translate/impl/impl.h
@@ -44,7 +44,7 @@ struct TranslatorVisitor final {
     boost::optional<BitMasks> DecodeBitMasks(bool N, Imm<6> immr, Imm<6> imms, bool immediate);
     u64 AdvSIMDExpandImm(bool op, Imm<4> cmode, Imm<8> imm8);
 
-    IR::U32U64 I(size_t bitsize, u64 value);
+    IR::UAny I(size_t bitsize, u64 value);
     IR::UAny X(size_t bitsize, Reg reg);
     void X(size_t bitsize, Reg reg, IR::U32U64 value);
     IR::U32U64 SP(size_t bitsize);