diff --git a/CHANGELOG.md b/CHANGELOG.md
index 66cf438..813f653 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## [Unreleased](https://github.com/dalance/sv-parser/compare/v0.6.4...Unreleased) - ReleaseDate
 
+* [Fixed] casting parse error [#8](https://github.com/dalance/sv-parser/issues/8)
+
 ## [v0.6.4](https://github.com/dalance/sv-parser/compare/v0.6.3...v0.6.4) - 2020-03-12
 
 * [Changed] error message of Error::Io
diff --git a/sv-parser-parser/src/declarations/net_and_variable_types.rs b/sv-parser-parser/src/declarations/net_and_variable_types.rs
index 93ffcbc..2d8b586 100644
--- a/sv-parser-parser/src/declarations/net_and_variable_types.rs
+++ b/sv-parser-parser/src/declarations/net_and_variable_types.rs
@@ -8,7 +8,9 @@ use crate::*;
 #[packrat_parser]
 pub(crate) fn casting_type(s: Span) -> IResult<Span, CastingType> {
     alt((
-        map(simple_type, |x| CastingType::SimpleType(Box::new(x))),
+        map(terminated(simple_type, peek(tag("'"))), |x| {
+            CastingType::SimpleType(Box::new(x))
+        }),
         map(signing, |x| CastingType::Signing(Box::new(x))),
         map(keyword("string"), |x| CastingType::String(Box::new(x))),
         map(keyword("const"), |x| CastingType::Const(Box::new(x))),
@@ -24,7 +26,9 @@ pub(crate) fn casting_type(s: Span) -> IResult<Span, CastingType> {
 #[packrat_parser]
 pub(crate) fn constant_casting_type(s: Span) -> IResult<Span, CastingType> {
     alt((
-        map(simple_type, |x| CastingType::SimpleType(Box::new(x))),
+        map(terminated(simple_type, peek(tag("'"))), |x| {
+            CastingType::SimpleType(Box::new(x))
+        }),
         map(signing, |x| CastingType::Signing(Box::new(x))),
         map(keyword("string"), |x| CastingType::String(Box::new(x))),
         map(keyword("const"), |x| CastingType::Const(Box::new(x))),
diff --git a/sv-parser-parser/src/tests.rs b/sv-parser-parser/src/tests.rs
index 793d569..4e5e00c 100644
--- a/sv-parser-parser/src/tests.rs
+++ b/sv-parser-parser/src/tests.rs
@@ -423,6 +423,11 @@ mod unit {
             r##"module a; assign a = a[$clog2(a)'(a)]; endmodule"##,
             Ok((_, _))
         );
+        test!(
+            source_text,
+            r##"module a; always begin a = b.c'(0); end endmodule"##,
+            Ok((_, _))
+        );
     }
 }
 
@@ -15881,6 +15886,10 @@ mod spec {
 
 #[test]
 fn debug() {
-    test!(expression, r##"a[$clog2(a)'(a)]"##, Ok((_, _)));
+    test!(
+        source_text,
+        r##"module a; always begin a = b.c'(0); end endmodule"##,
+        Ok((_, _))
+    );
     nom_tracable::cumulative_histogram();
 }