diff --git a/CHANGELOG.md b/CHANGELOG.md
index 609b30d..876883a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## [Unreleased](https://github.com/dalance/sv-parser/compare/v0.10.2...Unreleased) - ReleaseDate
 
+* [Fixed] empty port list is parsed as non-ANSI style
+
 ## [v0.10.2](https://github.com/dalance/sv-parser/compare/v0.10.1...v0.10.2) - 2021-01-06
 
 * [Fixed] embedded single line comment in macro [#28](https://github.com/dalance/sv-parser/issues/28)
diff --git a/sv-parser-parser/src/source_text/system_verilog_source_text.rs b/sv-parser-parser/src/source_text/system_verilog_source_text.rs
index ec1bf4d..d8a4d97 100644
--- a/sv-parser-parser/src/source_text/system_verilog_source_text.rs
+++ b/sv-parser-parser/src/source_text/system_verilog_source_text.rs
@@ -116,11 +116,11 @@ pub(crate) fn module_ansi_header(s: Span) -> IResult<Span, ModuleAnsiHeader> {
 #[packrat_parser]
 pub(crate) fn module_declaration(s: Span) -> IResult<Span, ModuleDeclaration> {
     alt((
-        module_declaration_nonansi,
         module_declaration_ansi,
+        module_declaration_nonansi,
         module_declaration_wildcard,
-        module_declaration_extern_nonansi,
         module_declaration_extern_ansi,
+        module_declaration_extern_nonansi,
     ))(s)
 }
 
@@ -212,11 +212,11 @@ pub(crate) fn module_keyword(s: Span) -> IResult<Span, ModuleKeyword> {
 #[packrat_parser]
 pub(crate) fn interface_declaration(s: Span) -> IResult<Span, InterfaceDeclaration> {
     alt((
-        interface_declaration_nonansi,
         interface_declaration_ansi,
+        interface_declaration_nonansi,
         interface_declaration_wildcard,
-        interface_declaration_extern_nonansi,
         interface_declaration_extern_ansi,
+        interface_declaration_extern_nonansi,
     ))(s)
 }
 
@@ -335,11 +335,11 @@ pub(crate) fn interface_ansi_header(s: Span) -> IResult<Span, InterfaceAnsiHeade
 #[packrat_parser]
 pub(crate) fn program_declaration(s: Span) -> IResult<Span, ProgramDeclaration> {
     alt((
-        program_declaration_nonansi,
         program_declaration_ansi,
+        program_declaration_nonansi,
         program_declaration_wildcard,
-        program_declaration_extern_nonansi,
         program_declaration_extern_ansi,
+        program_declaration_extern_nonansi,
     ))(s)
 }