diff --git a/src/plugins/cppeditor/cppindexingsupport.cpp b/src/plugins/cppeditor/cppindexingsupport.cpp
index d5455942e8f..bef033d1362 100644
--- a/src/plugins/cppeditor/cppindexingsupport.cpp
+++ b/src/plugins/cppeditor/cppindexingsupport.cpp
@@ -20,6 +20,7 @@
 #include <utils/temporarydirectory.h>
 
 #include <QLoggingCategory>
+#include <QRegularExpression>
 
 using namespace Utils;