diff --git a/src/shader_recompiler/backend/spirv/emit_spirv_convert.cpp b/src/shader_recompiler/backend/spirv/emit_spirv_convert.cpp
index d4ff3ff69..9fb9d44e2 100644
--- a/src/shader_recompiler/backend/spirv/emit_spirv_convert.cpp
+++ b/src/shader_recompiler/backend/spirv/emit_spirv_convert.cpp
@@ -272,12 +272,14 @@ Id EmitConvertU32U8(EmitContext& ctx, Id value) {
 }
 
 Id EmitConvertS32S8(EmitContext& ctx, Id value) {
+    ASSERT(ctx.profile.support_int8); // TODO
     const Id as_s8 = ctx.OpBitcast(ctx.S8, value);
     const Id as_s32 = ctx.OpSConvert(ctx.S32[1], as_s8);
     return ctx.OpBitcast(ctx.U32[1], as_s32);
 }
 
 Id EmitConvertS32S16(EmitContext& ctx, Id value) {
+    ASSERT(ctx.profile.support_int16); // TODO
     const Id as_s16 = ctx.OpBitcast(ctx.S16, value);
     const Id as_s32 = ctx.OpSConvert(ctx.S32[1], as_s16);
     return ctx.OpBitcast(ctx.U32[1], as_s32);
diff --git a/src/shader_recompiler/backend/spirv/spirv_emit_context.cpp b/src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
index 6a731d05c..87d6730ee 100644
--- a/src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
+++ b/src/shader_recompiler/backend/spirv/spirv_emit_context.cpp
@@ -117,7 +117,9 @@ void EmitContext::DefineArithmeticTypes() {
     void_id = Name(TypeVoid(), "void_id");
     U1[1] = Name(TypeBool(), "bool_id");
     U8 = Name(TypeUInt(8), "u8_id");
+    S8 = Name(TypeSInt(8), "i8_id");
     U16 = Name(TypeUInt(16), "u16_id");
+    S16 = Name(TypeSInt(16), "i16_id");
     if (info.uses_fp16) {
         F16[1] = Name(TypeFloat(16), "f16_id");
         U16 = Name(TypeUInt(16), "u16_id");