diff --git a/src/libCom/osi/epicsThread.h b/src/libCom/osi/epicsThread.h
index ab08e3d87..56710be20 100644
--- a/src/libCom/osi/epicsThread.h
+++ b/src/libCom/osi/epicsThread.h
@@ -103,16 +103,16 @@ epicsShareFunc void epicsShareAPI epicsThreadShow(
 
 /* Hooks being called when a thread starts or exits */
 typedef void (*EPICS_THREAD_HOOK_ROUTINE)(epicsThreadId id);
-epicsShareFunc void epicsShareAPI epicsThreadHooksInit(void);
-epicsShareFunc void epicsShareAPI epicsThreadAddStartHook(EPICS_THREAD_HOOK_ROUTINE hook);
-epicsShareFunc void epicsShareAPI epicsThreadAddExitHook(EPICS_THREAD_HOOK_ROUTINE hook);
-epicsShareFunc void epicsShareAPI epicsThreadRunStartHooks(epicsThreadId id);
-epicsShareFunc void epicsShareAPI epicsThreadRunExitHooks(epicsThreadId id);
+epicsShareFunc void epicsThreadHooksInit(void);
+epicsShareFunc void epicsThreadAddStartHook(EPICS_THREAD_HOOK_ROUTINE hook);
+epicsShareFunc void epicsThreadAddExitHook(EPICS_THREAD_HOOK_ROUTINE hook);
+epicsShareFunc void epicsThreadRunStartHooks(epicsThreadId id);
+epicsShareFunc void epicsThreadRunExitHooks(epicsThreadId id);
 epicsShareExtern EPICS_THREAD_HOOK_ROUTINE epicsThreadDefaultStartHook;
 epicsShareExtern EPICS_THREAD_HOOK_ROUTINE epicsThreadDefaultExitHook;
 
 /* Map func to all threads */
-epicsShareFunc void epicsShareAPI epicsThreadMap(EPICS_THREAD_HOOK_ROUTINE func);
+epicsShareFunc void epicsThreadMap(EPICS_THREAD_HOOK_ROUTINE func);
 
 typedef struct epicsThreadPrivateOSD * epicsThreadPrivateId;
 epicsShareFunc epicsThreadPrivateId epicsShareAPI epicsThreadPrivateCreate(void);
diff --git a/src/libCom/osi/os/default/osdThreadHooks.c b/src/libCom/osi/os/default/osdThreadHooks.c
index 9dc99e95e..c3a6a3fa8 100644
--- a/src/libCom/osi/os/default/osdThreadHooks.c
+++ b/src/libCom/osi/os/default/osdThreadHooks.c
@@ -63,17 +63,17 @@ static void runHooks (ELLLIST *list, epicsThreadId id) {
     epicsMutexUnlock(hookLock);
 }
 
-epicsShareFunc void epicsShareAPI epicsThreadAddStartHook(EPICS_THREAD_HOOK_ROUTINE hook)
+epicsShareFunc void epicsThreadAddStartHook(EPICS_THREAD_HOOK_ROUTINE hook)
 {
     addHook(&startHooks, hook, 0);
 }
 
-epicsShareFunc void epicsShareAPI epicsThreadAddExitHook(EPICS_THREAD_HOOK_ROUTINE hook)
+epicsShareFunc void epicsThreadAddExitHook(EPICS_THREAD_HOOK_ROUTINE hook)
 {
     addHook(&exitHooks, hook, 1);
 }
 
-epicsShareFunc void epicsShareAPI epicsThreadHooksInit(void)
+epicsShareFunc void epicsThreadHooksInit(void)
 {
     if (!hookLock) {
         hookLock = epicsMutexMustCreate();
@@ -82,12 +82,12 @@ epicsShareFunc void epicsShareAPI epicsThreadHooksInit(void)
     }
 }
 
-epicsShareFunc void epicsShareAPI epicsThreadRunStartHooks(epicsThreadId id)
+epicsShareFunc void epicsThreadRunStartHooks(epicsThreadId id)
 {
     runHooks(&startHooks, id);
 }
 
-epicsShareFunc void epicsShareAPI epicsThreadRunExitHooks(epicsThreadId id)
+epicsShareFunc void epicsThreadRunExitHooks(epicsThreadId id)
 {
     runHooks(&exitHooks, id);
 }
diff --git a/src/libCom/osi/os/posix/osdThread.c b/src/libCom/osi/os/posix/osdThread.c
index d1a0a2644..5653e5937 100644
--- a/src/libCom/osi/os/posix/osdThread.c
+++ b/src/libCom/osi/os/posix/osdThread.c
@@ -737,7 +737,7 @@ epicsShareFunc void epicsShareAPI epicsThreadGetName(epicsThreadId pthreadInfo,
     name[size-1] = '\0';
 }
 
-epicsShareFunc void epicsShareAPI epicsThreadMap(EPICS_THREAD_HOOK_ROUTINE func)
+epicsShareFunc void epicsThreadMap(EPICS_THREAD_HOOK_ROUTINE func)
 {
     epicsThreadOSD *pthreadInfo;
     int status;
diff --git a/src/libCom/osi/os/vxWorks/osdThread.c b/src/libCom/osi/os/vxWorks/osdThread.c
index 9e0e7b70e..61f2145f1 100644
--- a/src/libCom/osi/os/vxWorks/osdThread.c
+++ b/src/libCom/osi/os/vxWorks/osdThread.c
@@ -330,7 +330,7 @@ void epicsThreadGetName (epicsThreadId id, char *name, size_t size)
     name[size-1] = '\0';
 }
 
-epicsShareFunc void epicsShareAPI epicsThreadMap ( EPICS_THREAD_HOOK_ROUTINE func )
+epicsShareFunc void epicsThreadMap ( EPICS_THREAD_HOOK_ROUTINE func )
 {
     int noTasks = 0;
     int i;