diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4c52ca03c..ca2e78304 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -59,6 +59,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `add` is no longer colorized as a keyword in the SonarQube web interface.
 - `remove` is no longer colorized as a keyword in the SonarQube web interface.
 - `variant` is no longer colorized as a keyword in the SonarQube web interface.
+- Parsing errors on unusual whitespace characters.
 
 ## [0.40.0] - 2023-01-10
 
diff --git a/delphi-frontend/src/main/antlr3/au/com/integradev/delphi/antlr/Delphi.g b/delphi-frontend/src/main/antlr3/au/com/integradev/delphi/antlr/Delphi.g
index 731cb86f8..0615b8a8d 100644
--- a/delphi-frontend/src/main/antlr3/au/com/integradev/delphi/antlr/Delphi.g
+++ b/delphi-frontend/src/main/antlr3/au/com/integradev/delphi/antlr/Delphi.g
@@ -1276,7 +1276,7 @@ COMMENT                 :  '//' ~('\n'|'\r')*                          {$channel
                           }
                         }
                         ;
-WHITESPACE              : (' '|'\t'|'\r'|'\n'|'\f')+ {$channel=HIDDEN;}
+WHITESPACE              : ('\u0000'..'\u0020' | '\u3000')+ {$channel=HIDDEN;}
                         ;
 UnicodeBOM              : '\uFEFF' {$channel=HIDDEN;}
                         ;
diff --git a/delphi-frontend/src/test/java/au/com/integradev/delphi/antlr/GrammarTest.java b/delphi-frontend/src/test/java/au/com/integradev/delphi/antlr/GrammarTest.java
index b263814ac..b984f1927 100644
--- a/delphi-frontend/src/test/java/au/com/integradev/delphi/antlr/GrammarTest.java
+++ b/delphi-frontend/src/test/java/au/com/integradev/delphi/antlr/GrammarTest.java
@@ -237,4 +237,9 @@ void testEmptyFileShouldThrow() {
                     DelphiFileUtils.mockConfig()))
         .isInstanceOf(DelphiFileConstructionException.class);
   }
+
+  @Test
+  void testUnusualWhitespace() {
+    parseFile("UnusualWhitespace.pas");
+  }
 }
diff --git a/delphi-frontend/src/test/resources/au/com/integradev/delphi/grammar/UnusualWhitespace.pas b/delphi-frontend/src/test/resources/au/com/integradev/delphi/grammar/UnusualWhitespace.pas
new file mode 100644
index 000000000..3b4bad238
Binary files /dev/null and b/delphi-frontend/src/test/resources/au/com/integradev/delphi/grammar/UnusualWhitespace.pas differ