diff --git a/src/tools/moc/preprocessor.cpp b/src/tools/moc/preprocessor.cpp
index 5ce28d931b..11bf8d7937 100644
--- a/src/tools/moc/preprocessor.cpp
+++ b/src/tools/moc/preprocessor.cpp
@@ -696,9 +696,9 @@ Symbols Preprocessor::macroExpandIdentifier(Preprocessor *that, SymbolStack &sym
                     next = arg.at(0);
                 }
 
-                Symbol last = expansion.constLast();
-                if (!expansion.isEmpty() && last.token == s.token && last.token != STRING_LITERAL) {
-                    expansion.pop_back();
+                if (!expansion.isEmpty() && expansion.constLast().token == s.token
+                    && expansion.constLast().token != STRING_LITERAL) {
+                    Symbol last = expansion.takeLast();
 
                     QByteArray lexem = last.lexem() + next.lexem();
                     expansion += Symbol(lineNum, last.token, lexem);
diff --git a/tests/auto/tools/moc/parse-defines.h b/tests/auto/tools/moc/parse-defines.h
index 9fb5da4b07..6100bf67ad 100644
--- a/tests/auto/tools/moc/parse-defines.h
+++ b/tests/auto/tools/moc/parse-defines.h
@@ -139,6 +139,9 @@ public slots:
 signals:
     DEFINE_CMDLINE_SIGNAL;
 
+#define QTBUG55853(X) PD_DEFINE1(X, signalQTBUG55853)
+#define PD_EMPTY /* empty */
+    void QTBUG55853(PD_EMPTY)();
 };
 
 #undef QString
diff --git a/tests/auto/tools/moc/tst_moc.cpp b/tests/auto/tools/moc/tst_moc.cpp
index a3648c95b6..601b1bb36b 100644
--- a/tests/auto/tools/moc/tst_moc.cpp
+++ b/tests/auto/tools/moc/tst_moc.cpp
@@ -3397,6 +3397,9 @@ void tst_Moc::parseDefines()
 
     index = mo->indexOfSignal("cmdlineSignal(QMap<int,int>)");
     QVERIFY(index != -1);
+
+    index = mo->indexOfSignal("signalQTBUG55853()");
+    QVERIFY(index != -1);
 }
 
 void tst_Moc::preprocessorOnly()