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