diff --git a/src/check_asm.cpp b/src/check_asm.cpp
index 4bad35ba8..69912c339 100644
--- a/src/check_asm.cpp
+++ b/src/check_asm.cpp
@@ -1476,6 +1476,13 @@ gb_internal void check_asm_instruction_operand(AsmCtx *asm_ctx, CheckerContext *
 	gb_unused(label_scope);
 
 	switch (expr->kind) {
+	case_ast_node(ue, UnaryExpr, expr);
+		check_expr(ctx, operand, expr);
+		if (operand->mode != Addressing_Constant) {
+			error(expr, "Asm operands within unary operands (+ - ~) can only compile time constants");
+		}
+		return;
+	case_end;
 	case_ast_node(pe, ParenExpr, expr);
 		check_expr(ctx, operand, expr);
 		if (operand->mode != Addressing_Constant) {
diff --git a/src/parser.cpp b/src/parser.cpp
index 572c638a2..64f73e0ab 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -2484,6 +2484,16 @@ gb_internal Ast *parse_asm_operand(AstFile *f, bool allow_memory_operand) {
 	case Token_Float:
 	case Token_Rune:
 		return ast_basic_lit(f, advance_token(f));
+
+	case Token_Add:
+	case Token_Sub:
+	case Token_Xor:
+		{
+			Token token = advance_token(f);
+			Ast *op = parse_asm_operand(f, false);
+			return ast_unary_expr(f, token, op);
+		}
+
 	case Token_OpenParen:
 		return parse_expr(f, false);
 	case Token_OpenBracket: