diff --git a/config.tests/x86intrin/main.cpp b/config.tests/x86intrin/main.cpp
index 4306a4721c9..297586fb4e7 100644
--- a/config.tests/x86intrin/main.cpp
+++ b/config.tests/x86intrin/main.cpp
@@ -12,7 +12,9 @@ int test(int argc, char **argv)
 {
     unsigned randomvalue;
     _rdrand32_step(&randomvalue);               // RDRND (IVB)
+#ifndef __QNXNTO__  // buggy compiler is missing this intrinsic, but we allow it
     _rdseed32_step(&randomvalue);               // RDSEED (BDW)
+#endif
     unsigned mask = _blsmsk_u32(argc);          // BMI (HSW)
     int clz = _lzcnt_u32(mask);                 // LZCNT (HSW)
     int ctz = _tzcnt_u32(mask);                 // BMI (HSW)
diff --git a/src/corelib/global/qsimd_p.h b/src/corelib/global/qsimd_p.h
index af557bc976d..ad78c3934fb 100644
--- a/src/corelib/global/qsimd_p.h
+++ b/src/corelib/global/qsimd_p.h
@@ -173,6 +173,10 @@ QT_WARNING_DISABLE_INTEL(103)
 #ifdef Q_PROCESSOR_X86
 /* -- x86 intrinsic support -- */
 
+#  if defined(QT_COMPILER_SUPPORTS_RDSEED) && defined(Q_OS_QNX)
+// The compiler for QNX is missing the intrinsic
+#    undef QT_COMPILER_SUPPORTS_RDSEED
+#  endif
 #  if defined(Q_CC_MSVC) && (defined(_M_X64) || _M_IX86_FP >= 2)
 // MSVC doesn't define __SSE2__, so do it ourselves
 #    define __SSE__                         1