diff --git a/src/corelib/global/qtconfigmacros.h b/src/corelib/global/qtconfigmacros.h
index 2bb1016cac..a89894ff24 100644
--- a/src/corelib/global/qtconfigmacros.h
+++ b/src/corelib/global/qtconfigmacros.h
@@ -10,6 +10,8 @@
 
 #include <QtCore/qtconfiginclude.h>
 
+#include <assert.h>
+
 /*
    The Qt modules' export macros.
    The options are:
@@ -58,7 +60,7 @@
         1: The feature is available
 */
 #define QT_CONFIG(feature) (1/QT_FEATURE_##feature == 1)
-#define QT_REQUIRE_CONFIG(feature) Q_STATIC_ASSERT_X(QT_FEATURE_##feature == 1, "Required feature " #feature " for file " __FILE__ " not available.")
+#define QT_REQUIRE_CONFIG(feature) static_assert(QT_FEATURE_##feature == 1, "Required feature " #feature " for file " __FILE__ " not available.")
 
 /* moc compats (signals/slots) */
 #ifndef QT_MOC_COMPAT
diff --git a/src/corelib/global/qtypes.h b/src/corelib/global/qtypes.h
index fa41f03c44..d08a919c13 100644
--- a/src/corelib/global/qtypes.h
+++ b/src/corelib/global/qtypes.h
@@ -11,6 +11,8 @@
 #ifdef __cplusplus
 #  include <cstddef>
 #  include <cstdint>
+#else
+#  include <assert.h>
 #endif
 
 #if 0
@@ -58,7 +60,7 @@ typedef quint64 qulonglong;
 
 #ifndef __cplusplus
 // In C++ mode, we define below using QIntegerForSize template
-Q_STATIC_ASSERT_X(sizeof(ptrdiff_t) == sizeof(size_t), "Weird ptrdiff_t and size_t definitions");
+static_assert(sizeof(ptrdiff_t) == sizeof(size_t), "Weird ptrdiff_t and size_t definitions");
 typedef ptrdiff_t qptrdiff;
 typedef ptrdiff_t qsizetype;
 typedef ptrdiff_t qintptr;