diff --git a/src/libCom/osi/os/RTEMS/epicsMath.h b/src/libCom/osi/os/RTEMS/epicsMath.h
index 3b8b38f75..05ac6ac51 100644
--- a/src/libCom/osi/os/RTEMS/epicsMath.h
+++ b/src/libCom/osi/os/RTEMS/epicsMath.h
@@ -17,6 +17,8 @@ extern "C" {
 #endif
 
 int isnan(double);
+int finite(double);
+int isinf(double);
 
 #ifdef __cplusplus
 }