diff --git a/sv-parser-pp/src/preprocess.rs b/sv-parser-pp/src/preprocess.rs
index 4db5ba6..8fea4d6 100644
--- a/sv-parser-pp/src/preprocess.rs
+++ b/sv-parser-pp/src/preprocess.rs
@@ -1499,4 +1499,21 @@ mod tests {
         );
         assert_eq!(format!("{:?}", ret), "Err(ExceedRecursiveLimit)");
     } // }}}
+
+    #[test]
+    fn timescale() { // {{{
+        let include_paths = [testfile_path("")];
+        let (ret, _) = preprocess(
+            testfile_path("timescale.sv"),
+            &HashMap::new(),
+            &include_paths,
+            false,
+            false,
+        )
+        .unwrap();
+        assert_eq!(
+            ret.text(),
+            testfile_contents("timescale.sv")
+        );
+    } // }}}
 }
diff --git a/sv-parser-pp/testcases/timescale.sv b/sv-parser-pp/testcases/timescale.sv
new file mode 100644
index 0000000..89822f5
--- /dev/null
+++ b/sv-parser-pp/testcases/timescale.sv
@@ -0,0 +1,17 @@
+// IEEE1800-2017 Clause 22.7
+// This directive specifies the time unit and time precision of the design
+// elements that follow it. The time unit is the unit of measurement for time
+// values such as the simulation time and delay values.
+// The `timescale compiler directive specifies the default unit of measurement
+// for time and delay values and the degree of accuracy for delays in all
+// design elements that follow this directive, and that do not have timeunit
+// and timeprecision constructs specified within the design element, until
+// another `timescale compiler directive is read.
+// The integers in these arguments specify an order of magnitude for the size
+// of the value; the valid integers are 1, 10, and 100.
+// The character strings represent units of measurement; the valid character
+// strings are s, ms, us, ns, ps, and fs.
+`timescale 1 s / 10 ms
+`timescale 10 us / 100 ns
+`timescale 100 ps / 100 fs
+// This file should be emitted from the preprocessor unchanged.