diff --git a/src/libCom/osi/os/posix/epicsMath.h b/src/libCom/osi/os/posix/epicsMath.h
index a8e9b815f..6a76f0afb 100644
--- a/src/libCom/osi/os/posix/epicsMath.h
+++ b/src/libCom/osi/os/posix/epicsMath.h
@@ -18,11 +18,13 @@
 #if __cplusplus>=201103L
 #include <cmath>
 
+#if __GLIBCXX__>20160427
 using std::isfinite;
 using std::isinf;
 using std::isnan;
 using std::isnormal;
 #endif
+#endif /* c++11 */
 
 extern "C" {
 #endif