diff --git a/src/libCom/osi/os/posix/epicsMath.h b/src/libCom/osi/os/posix/epicsMath.h
index 13f25e520..1ef96d76f 100644
--- a/src/libCom/osi/os/posix/epicsMath.h
+++ b/src/libCom/osi/os/posix/epicsMath.h
@@ -18,8 +18,10 @@
 #include <cmath>
 
 using std::isfinite;
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
 using std::isinf;
 using std::isnan;
+#endif
 using std::isnormal;
 
 extern "C" {