diff --git a/src/libCom/osi/os/RTEMS/osdSem.c b/src/libCom/osi/os/RTEMS/osdSem.c
index 678b872d1..84da5bb17 100644
--- a/src/libCom/osi/os/RTEMS/osdSem.c
+++ b/src/libCom/osi/os/RTEMS/osdSem.c
@@ -127,7 +127,7 @@ semBinaryTakeNoWait(semBinaryId id)
 }
 
 void
-semBinaryShow(semBinaryId id,int level)
+semBinaryShow(semBinaryId id,unsigned int level)
 {
 }
 
@@ -197,7 +197,7 @@ semTakeStatus semMutexTakeNoWait(semMutexId id)
 	return semBinaryTakeNoWait (id);
 }
 
-epicsShareFunc void semMutexShow(semMutexId id,int level)
+epicsShareFunc void semMutexShow(semMutexId id,unsigned int level)
 {
 	semBinaryShow (id,level);
 }
diff --git a/src/libCom/osi/os/posix/osdSem.c b/src/libCom/osi/os/posix/osdSem.c
index e99f3528e..ad7ab5dea 100644
--- a/src/libCom/osi/os/posix/osdSem.c
+++ b/src/libCom/osi/os/posix/osdSem.c
@@ -145,7 +145,7 @@ semTakeStatus semBinaryTakeNoWait(semBinaryId id)
     return(semTakeError);
 }
 
-void semBinaryShow(semBinaryId id, int level)
+void semBinaryShow(semBinaryId id,unsigned int level)
 {
 }
 
@@ -284,7 +284,7 @@ semTakeStatus semMutexTakeNoWait(semMutexId id)
     return(status);
 }
 
-void semMutexShow(semMutexId id, int level)
+void semMutexShow(semMutexId id,unsigned int level)
 {
     mutex *pmutex = (mutex *)id;
     printf("ownerTid %p count %d owned %d\n",
diff --git a/src/libCom/osi/os/vxWorks/osdSem.c b/src/libCom/osi/os/vxWorks/osdSem.c
index 8d2e6a02c..4b9aba979 100644
--- a/src/libCom/osi/os/vxWorks/osdSem.c
+++ b/src/libCom/osi/os/vxWorks/osdSem.c
@@ -66,7 +66,7 @@ semTakeStatus semBinaryTakeNoWait(semBinaryId id)
     return(semTakeError);
 }
 
-void semBinaryShow(semBinaryId id, int level)
+void semBinaryShow(semBinaryId id,unsigned int level)
 {
     semShow((SEM_ID)id,level);
 }
@@ -120,7 +120,7 @@ semTakeStatus semMutexTakeNoWait(semMutexId id)
     return(semTakeError);
 }
 
-void semMutexShow(semMutexId id, int level)
+void semMutexShow(semMutexId id,unsigned int level)
 {
     semShow((SEM_ID)id,level);
 }
diff --git a/src/libCom/osi/osiSem.h b/src/libCom/osi/osiSem.h
index 0ac0baae4..2639f25e2 100644
--- a/src/libCom/osi/osiSem.h
+++ b/src/libCom/osi/osiSem.h
@@ -23,7 +23,7 @@ epicsShareFunc semTakeStatus epicsShareAPI semBinaryTake(semBinaryId id);
 epicsShareFunc semTakeStatus epicsShareAPI semBinaryTakeTimeout(
     semBinaryId id, double timeOut);
 epicsShareFunc semTakeStatus epicsShareAPI semBinaryTakeNoWait(semBinaryId id);
-epicsShareFunc void epicsShareAPI semBinaryShow(semBinaryId id, int level);
+epicsShareFunc void epicsShareAPI semBinaryShow(semBinaryId id, unsigned int level);
 
 typedef void *semMutexId;
 epicsShareFunc semMutexId epicsShareAPI semMutexCreate(void);
@@ -35,7 +35,7 @@ epicsShareFunc semTakeStatus epicsShareAPI semMutexTake(semMutexId id);
 epicsShareFunc semTakeStatus epicsShareAPI semMutexTakeTimeout(
     semMutexId id, double timeOut);
 epicsShareFunc semTakeStatus epicsShareAPI semMutexTakeNoWait(semMutexId id);
-epicsShareFunc void epicsShareAPI semMutexShow(semMutexId id, int level);
+epicsShareFunc void epicsShareAPI semMutexShow(semMutexId id,unsigned  int level);
 
 /*NOTES:
     Mutex semaphores MUST implement recursive locking