diff --git a/tests/benchmarks/corelib/tools/qregexp/qregexp.pro b/tests/benchmarks/corelib/tools/qregexp/qregexp.pro
index 74544519f34..d194d2b698b 100644
--- a/tests/benchmarks/corelib/tools/qregexp/qregexp.pro
+++ b/tests/benchmarks/corelib/tools/qregexp/qregexp.pro
@@ -11,7 +11,7 @@ qtHaveModule(script):!pcre {
     QT += script
 }
 
-exists( /usr/include/boost/regex.hpp ){
+exists($$[QT_SYSROOT]/usr/include/boost/regex.hpp) {
 DEFINES+=HAVE_BOOST
 LIBS+=-lboost_regex
 }