diff --git a/libs/macro/computer.c b/libs/macro/computer.c
index 06bdcd83c..d345b9d73 100644
--- a/libs/macro/computer.c
+++ b/libs/macro/computer.c
@@ -305,9 +305,9 @@ static inline int computer_const_number(computer *const comp, const item_t pos,
  */
 
 
-computer computer_create(location *const loc, universal_io *const io)
+computer computer_create(location *const loc, universal_io *const io, const char *const directive)
 {
-	return (computer) { .loc = loc_copy(loc), .io = io
+	return (computer) { .loc = loc_copy(loc), .io = io, .directive = directive
 		, .numbers = stack_create(MAX_EXPRESSION_DAPTH)
 		, .operators = stack_create(MAX_EXPRESSION_DAPTH)
 		, .was_number = false };
@@ -396,6 +396,12 @@ item_t computer_pop_result(computer *const comp)
 		return 0;
 	}
 
+	if (stack_size(&comp->numbers) == 0)
+	{
+		computer_error(comp, ITEM_MAX, DIRECTIVE_NO_EXPRESSION, comp->directive);
+		return 0;
+	}
+
 	if (!comp->was_number)
 	{
 		char token[3];
diff --git a/libs/macro/computer.h b/libs/macro/computer.h
index 1dc1bfcb2..32b38db94 100644
--- a/libs/macro/computer.h
+++ b/libs/macro/computer.h
@@ -74,6 +74,7 @@ typedef struct computer
 
 	location loc;					/**< Directive location */
 	universal_io *io;				/**< IO for location assembly */
+	const char *directive;			/**< Directive name for error emitting */
 
 	bool was_number;				/**< Set, if last push is number */
 } computer;
@@ -83,10 +84,12 @@ typedef struct computer
  *	Create computer structure
  *
  *	@param	loc			Default location
+ *	@param	io			Location IO
+ *	@param	directive	Directive name
  *
  *	@return	Computer structure
  */
-computer computer_create(location *const loc, universal_io *const io);
+computer computer_create(location *const loc, universal_io *const io, const char *const directive);
 
 
 /**
diff --git a/libs/macro/parser.c b/libs/macro/parser.c
index 40a11ec68..49dec77d6 100644
--- a/libs/macro/parser.c
+++ b/libs/macro/parser.c
@@ -439,13 +439,17 @@ static inline char32_t skip_macro(parser *const prs, const keyword_t keyword)
 		if (utf8_is_letter(character))
 		{
 			const char *value = storage_get_by_index(prs->stg, storage_search(prs->stg, prs->io));
-			if (value != NULL)
+			if (value == NULL)
 			{
-				uni_printf(prs->io, MASK_ARGUMENT "%s", value);
+				uni_printf(prs->io, "%s", storage_last_read(prs->stg));
+			}
+			else if (keyword == KW_IFDEF || keyword == KW_IFNDEF)
+			{
+				uni_printf(prs->io, MASK_TOKEN_PASTE "%s", value);
 			}
 			else
 			{
-				uni_printf(prs->io, "%s", storage_last_read(prs->stg));
+				uni_printf(prs->io, MASK_ARGUMENT "%s", value);
 			}
 		}
 		else if (character == '\'' || character == '"' || (character == '<' && keyword == KW_INCLUDE))
@@ -1460,10 +1464,13 @@ static inline bool parse_token(parser *const prs, computer *const comp, const si
 static item_t parse_expression(parser *const prs)
 {
 	location loc = parse_location(prs);
+	char directive[MAX_KEYWORD_SIZE];
+	sprintf(directive, "%s", storage_last_read(prs->stg));
+
 	char32_t character = skip_until(prs, false);
 	if (character == '\n' || character == (char32_t)EOF)
 	{
-		parser_error(prs, &loc, DIRECTIVE_NO_EXPRESSION, storage_last_read(prs->stg));
+		parser_error(prs, &loc, DIRECTIVE_NO_EXPRESSION, directive);
 		return 0;
 	}
 
@@ -1471,7 +1478,8 @@ static item_t parse_expression(parser *const prs)
 	location *origin_loc = prs->loc;
 	location *origin_prev = prs->prev;
 
-	computer comp = prs->prev == NULL ? computer_create(&loc, prs->io) : computer_create(prs->prev, NULL);
+	computer comp = prs->prev == NULL ? computer_create(&loc, prs->io, directive)
+		: computer_create(prs->prev, NULL, directive);
 	size_t position = in_get_position(prs->io);
 	universal_io out = io_create();
 	char *buffer = NULL;