diff --git a/src/libCom/osi/os/posix/epicsMath.h b/src/libCom/osi/os/posix/epicsMath.h
index b09c7024b..4ed0fdc51 100644
--- a/src/libCom/osi/os/posix/epicsMath.h
+++ b/src/libCom/osi/os/posix/epicsMath.h
@@ -17,6 +17,11 @@
 extern "C" {
 #endif
 
+#ifdef isfinite
+#  undef finite
+#  define finite(x) isfinite(x)
+#endif
+
 epicsShareExtern float epicsNAN;
 epicsShareExtern float epicsINF;