diff --git a/src/qml/jsruntime/qv4global_p.h b/src/qml/jsruntime/qv4global_p.h
index 273f27184..ad5be89c8 100644
--- a/src/qml/jsruntime/qv4global_p.h
+++ b/src/qml/jsruntime/qv4global_p.h
@@ -76,7 +76,7 @@ inline bool isfinite(double d) { return _finite(d); }
 
 } // namespace std
 
-inline double trunc(double d) { return d > 0 ? floor(d) : ceil(d); }
+//inline double trunc(double d) { return d > 0 ? floor(d) : ceil(d); }
 #endif
 
 // Do certain things depending on whether the JIT is enabled or disabled
diff --git a/src/qml/jsruntime/qv4mathobject.cpp b/src/qml/jsruntime/qv4mathobject.cpp
index 9802579cd..4d447b530 100644
--- a/src/qml/jsruntime/qv4mathobject.cpp
+++ b/src/qml/jsruntime/qv4mathobject.cpp
@@ -47,7 +47,7 @@
 #include <QtCore/private/qnumeric_p.h>
 #include <QtCore/qthreadstorage.h>
 
-#include <math.h>
+//#include <math.h>
 #include <cmath>
 
 using namespace QV4;
diff --git a/src/qml/jsruntime/qv4stringobject.cpp b/src/qml/jsruntime/qv4stringobject.cpp
index 6ebbe5a45..d479ce709 100644
--- a/src/qml/jsruntime/qv4stringobject.cpp
+++ b/src/qml/jsruntime/qv4stringobject.cpp
@@ -531,9 +531,9 @@ ReturnedValue StringPrototype::method_lastIndexOf(const FunctionObject *b, const
     if (std::isnan(position))
         position = +qInf();
     else
-        position = trunc(position);
+        position = std::trunc(position);
 
-    int pos = trunc(qMin(qMax(position, 0.0), double(value.length())));
+    int pos = std::trunc(qMin(qMax(position, 0.0), double(value.length())));
     if (!searchString.isEmpty() && pos == value.length())
         --pos;
     if (searchString.isNull() && pos == 0)