diff --git a/src/libCom/osi/os/posix/osdThread.c b/src/libCom/osi/os/posix/osdThread.c
index 5b5703463..bc13e24ca 100644
--- a/src/libCom/osi/os/posix/osdThread.c
+++ b/src/libCom/osi/os/posix/osdThread.c
@@ -641,8 +641,8 @@ void *epicsThreadPrivateGet(epicsThreadPrivateId id)
 
 double epicsThreadSleepQuantum ()
 {
-    double HZ;
-    HZ = sysconf ( _SC_CLK_TCK );
-    return 1.0 / HZ;
+    double hz;
+    hz = sysconf ( _SC_CLK_TCK );
+    return 1.0 / hz;
 }