diff --git a/src/corelib/global/qfloat16.cpp b/src/corelib/global/qfloat16.cpp
index d816d8b888..902a1aebe2 100644
--- a/src/corelib/global/qfloat16.cpp
+++ b/src/corelib/global/qfloat16.cpp
@@ -200,7 +200,7 @@ static inline bool hasFastF16()
 }
 
 QT_FUNCTION_TARGET(F16C)
-void qFloatToFloat16_fast(quint16 *out, const float *in, qsizetype len) Q_DECL_NOEXCEPT
+static void qFloatToFloat16_fast(quint16 *out, const float *in, qsizetype len) noexcept
 {
     qsizetype i = 0;
     int epilog_i;
@@ -216,7 +216,7 @@ void qFloatToFloat16_fast(quint16 *out, const float *in, qsizetype len) Q_DECL_N
 }
 
 QT_FUNCTION_TARGET(F16C)
-void qFloatFromFloat16_fast(float *out, const quint16 *in, qsizetype len) Q_DECL_NOEXCEPT
+static void qFloatFromFloat16_fast(float *out, const quint16 *in, qsizetype len) noexcept
 {
     qsizetype i = 0;
     int epilog_i;