diff --git a/libstdc++-v3/include/bits/random.tcc b/libstdc++-v3/include/bits/random.tcc
index f4b9778e468e..b4273f058b44 100644
--- a/libstdc++-v3/include/bits/random.tcc
+++ b/libstdc++-v3/include/bits/random.tcc
@@ -83,7 +83,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       __normalize(_InputIterator __first, _InputIterator __last,
 		  _OutputIterator __result, const _Tp& __factor)
       {
-	for (; __first != __last; ++__first, ++__result)
+	for (; __first != __last; ++__first, (void) ++__result)
 	  *__result = *__first / __factor;
 	return __result;
       }
@@ -3201,7 +3201,7 @@ namespace __detail
 		 _InputIteratorW __wbegin)
       : _M_int(), _M_den(), _M_cp(), _M_m()
       {
-	for (; __bbegin != __bend; ++__bbegin, ++__wbegin)
+	for (; __bbegin != __bend; ++__bbegin, (void) ++__wbegin)
 	  {
 	    _M_int.push_back(*__bbegin);
 	    _M_den.push_back(*__wbegin);
diff --git a/libstdc++-v3/testsuite/26_numerics/random/piecewise_linear_distribution/cons/122062.cc b/libstdc++-v3/testsuite/26_numerics/random/piecewise_linear_distribution/cons/122062.cc
new file mode 100644
index 000000000000..0f0caa7f89b4
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/piecewise_linear_distribution/cons/122062.cc
@@ -0,0 +1,16 @@
+// { dg-do compile { target c++11 } }
+
+// PR libstdc++/122062
+// piecewise_linear_distribution(firstB, lastB, firstW) invokes comma operator
+
+#include <random>
+#include <testsuite_iterators.h>
+
+void
+test_pr122062()
+{
+  double b[1]{};
+  double w[1]{};
+  __gnu_test::random_access_container<double> B(b), W(w);
+  std::piecewise_linear_distribution<double> p(B.begin(), B.end(), W.begin());
+}