diff --git a/__tests__/parse.test.ts b/__tests__/parse.test.ts
index 59e3568..5b6c321 100644
--- a/__tests__/parse.test.ts
+++ b/__tests__/parse.test.ts
@@ -519,4 +519,13 @@ describe('parseContentType', () => {
       parameters: { name: 'prüfbericht.pdf' },
     });
   });
+
+  // Issue #17: https://github.com/mat-sz/letterparser/issues/17
+  it('should handle empty space correctly', () => {
+    expect(parseContentType('text/plain; charset = "utf-8"')).toMatchObject({
+      type: 'text/plain',
+      encoding: 'utf-8',
+      parameters: { charset: 'utf-8' },
+    });
+  });
 });
diff --git a/src/parser.ts b/src/parser.ts
index 79c3a5d..417fc96 100644
--- a/src/parser.ts
+++ b/src/parser.ts
@@ -35,7 +35,7 @@ export function parseHeaderValue(
         continue;
       }
 
-      let value = parameterSplit[1];
+      let value = parameterSplit[1].trim();
       if (parameterSplit.length > 2) {
         value = parameterSplit.slice(1).join('=');
       }