diff --git a/src/libs/cplusplus/pp-engine.cpp b/src/libs/cplusplus/pp-engine.cpp
index 321666ea4c4..f90c02b9080 100644
--- a/src/libs/cplusplus/pp-engine.cpp
+++ b/src/libs/cplusplus/pp-engine.cpp
@@ -699,9 +699,16 @@ void Preprocessor::preprocess(const QByteArray &fileName, const QByteArray &sour
                 const unsigned endOfPreviousToken = (_dot - 1)->end();
                 const unsigned beginOfToken = _dot->begin();
 
-                const char *it = _source.constBegin() + endOfPreviousToken;
+                const char *start = _source.constBegin() + endOfPreviousToken;
                 const char *end = _source.constBegin() + beginOfToken;
 
+                const char *it = end - 1;
+                for (; it != start - 1; --it) {
+                    if (*it == '\n')
+                        break;
+                }
+                ++it;
+
                 for (; it != end; ++it) {
                     if (std::isspace(*it))
                         _result->append(*it);