diff --git a/libyul/AsmParser.cpp b/libyul/AsmParser.cpp
index c43066ee0..25b94157c 100644
--- a/libyul/AsmParser.cpp
+++ b/libyul/AsmParser.cpp
@@ -327,6 +327,9 @@ variant<Literal, Identifier> Parser::parseLiteralOrIdentifier()
 	case Token::HexStringLiteral:
 		fatalParserError(3772_error, "Hex literals are not valid in this context.");
 		break;
+	case Token::Illegal:
+		fatalParserError(1465_error, "Illegal token: " + to_string(m_scanner->currentError()));
+		break;
 	default:
 		fatalParserError(1856_error, "Literal or identifier expected.");
 	}
diff --git a/test/libsolidity/syntaxTests/inlineAssembly/invalid/invalid_number.sol b/test/libsolidity/syntaxTests/inlineAssembly/invalid/invalid_number.sol
index b894fc6b8..1ba49bc39 100644
--- a/test/libsolidity/syntaxTests/inlineAssembly/invalid/invalid_number.sol
+++ b/test/libsolidity/syntaxTests/inlineAssembly/invalid/invalid_number.sol
@@ -6,4 +6,4 @@ contract C {
   }
 }
 // ----
-// ParserError 1856: (72-73): Literal or identifier expected.
+// ParserError 1465: (72-73): Illegal token: Octal numbers not allowed.
diff --git a/test/libyul/yulSyntaxTests/invalid/invalid_octal_number.yul b/test/libyul/yulSyntaxTests/invalid/invalid_octal_number.yul
index c3b5e02c2..446c29315 100644
--- a/test/libyul/yulSyntaxTests/invalid/invalid_octal_number.yul
+++ b/test/libyul/yulSyntaxTests/invalid/invalid_octal_number.yul
@@ -2,4 +2,4 @@
     let x := 0100
 }
 // ----
-// ParserError 1856: (15-16): Literal or identifier expected.
+// ParserError 1465: (15-16): Illegal token: Octal numbers not allowed.
diff --git a/test/libyul/yulSyntaxTests/invalid/unicode_comment_direction_override.sol b/test/libyul/yulSyntaxTests/invalid/unicode_comment_direction_override.sol
index dffb49ec3..7fb5547f7 100644
--- a/test/libyul/yulSyntaxTests/invalid/unicode_comment_direction_override.sol
+++ b/test/libyul/yulSyntaxTests/invalid/unicode_comment_direction_override.sol
@@ -3,4 +3,4 @@
     // underflow ‬
 }
 // ----
-// ParserError 1856: (19-32): Literal or identifier expected.
+// ParserError 1465: (19-32): Illegal token: Unicode direction override underflow in comment or string literal.
diff --git a/test/libyul/yulSyntaxTests/invalid/unicode_string_direction_override.sol b/test/libyul/yulSyntaxTests/invalid/unicode_string_direction_override.sol
index ee4e95236..2dba69450 100644
--- a/test/libyul/yulSyntaxTests/invalid/unicode_string_direction_override.sol
+++ b/test/libyul/yulSyntaxTests/invalid/unicode_string_direction_override.sol
@@ -3,4 +3,4 @@
     let s := unicode"underflow ‬";
 }
 // ----
-// ParserError 1856: (35-47): Literal or identifier expected.
+// ParserError 1465: (35-47): Illegal token: Invalid character in string.