diff --git a/src/libs/cplusplus/pp-engine.cpp b/src/libs/cplusplus/pp-engine.cpp
index 83a104ba102..1748a322e68 100644
--- a/src/libs/cplusplus/pp-engine.cpp
+++ b/src/libs/cplusplus/pp-engine.cpp
@@ -654,12 +654,12 @@ void Preprocessor::handleDefined(PPToken *tk)
             break;
     } while (isValidToken(*tk));
 
-    if (lparenSeen) {
-        while (tk->isNot(T_RPAREN))
-            lex(tk);
-    } else {
-        pushToken(tk);
-    }
+
+    if (lparenSeen && tk->is(T_RPAREN))
+        lex(tk);
+
+    pushToken(tk);
+
     QByteArray result(1, '0');
     if (m_env->resolve(idToken.asByteArrayRef()))
         result[0] = '1';
diff --git a/tests/auto/cplusplus/preprocessor/tst_preprocessor.cpp b/tests/auto/cplusplus/preprocessor/tst_preprocessor.cpp
index bc669ab9b5f..e1ddc900be7 100644
--- a/tests/auto/cplusplus/preprocessor/tst_preprocessor.cpp
+++ b/tests/auto/cplusplus/preprocessor/tst_preprocessor.cpp
@@ -886,6 +886,26 @@ void tst_Preprocessor::defined_data()
         "#if X <= 0x040000\n"
         "#define Y 1\n"
         "#endif\n";
+
+    QTest::newRow("incomplete defined 1") << true << true <<
+        "#define X 0x040500\n"
+        "#if defined(X\n"
+        "#define Y 1\n"
+        "#endif\n";
+    QTest::newRow("incomplete defined 2") << false << false <<
+        "#if defined(X\n"
+        "#define Y 1\n"
+        "#endif\n";
+    QTest::newRow("complete defined 1") << true << true <<
+        "#define X 0x040500\n"
+        "#if defined(X )\n"
+        "#define Y 1\n"
+        "#endif\n";
+    QTest::newRow("complete defined 2") << true << true <<
+        "#define X 0x040500\n"
+        "#if defined(X/*xxx*/)\n"
+        "#define Y 1\n"
+        "#endif\n";
 }
 
 QTEST_APPLESS_MAIN(tst_Preprocessor)