diff --git a/cpukit/rtems/src/schedulermapfromposix.c b/cpukit/rtems/src/schedulermapfromposix.c
index 7d3161658b..0552b1d456 100644
--- a/cpukit/rtems/src/schedulermapfromposix.c
+++ b/cpukit/rtems/src/schedulermapfromposix.c
@@ -62,7 +62,7 @@ rtems_status_code rtems_scheduler_map_priority_from_posix(
     return RTEMS_INVALID_PRIORITY;
   }
 
-  if ( posix_priority >= scheduler->maximum_priority ) {
+  if ( (uint32_t) posix_priority >= scheduler->maximum_priority ) {
     return RTEMS_INVALID_PRIORITY;
   }
 
diff --git a/cpukit/score/src/schedulercbsattachthread.c b/cpukit/score/src/schedulercbsattachthread.c
index 79037a9b67..4e4c66785a 100644
--- a/cpukit/score/src/schedulercbsattachthread.c
+++ b/cpukit/score/src/schedulercbsattachthread.c
@@ -62,7 +62,7 @@ int _Scheduler_CBS_Attach_thread (
     return SCHEDULER_CBS_ERROR_NOSERVER;
   }
 
-  if ( server->task_id != -1 ) {
+  if ( server->task_id != (rtems_id)-1 ) {
     return SCHEDULER_CBS_ERROR_FULL;
   }
 
diff --git a/cpukit/score/src/schedulercbscreateserver.c b/cpukit/score/src/schedulercbscreateserver.c
index 5a1a93dc24..2052984264 100644
--- a/cpukit/score/src/schedulercbscreateserver.c
+++ b/cpukit/score/src/schedulercbscreateserver.c
@@ -53,8 +53,8 @@ int _Scheduler_CBS_Create_server (
 
   if ( params->budget <= 0 ||
        params->deadline <= 0 ||
-       params->budget >= SCHEDULER_EDF_PRIO_MSB ||
-       params->deadline >= SCHEDULER_EDF_PRIO_MSB )
+       params->budget >= (time_t)SCHEDULER_EDF_PRIO_MSB ||
+       params->deadline >= (time_t)SCHEDULER_EDF_PRIO_MSB )
     return SCHEDULER_CBS_ERROR_INVALID_PARAMETER;
 
   for ( i = 0; i<_Scheduler_CBS_Maximum_servers; i++ ) {
diff --git a/cpukit/score/src/schedulercbsgetexecutiontime.c b/cpukit/score/src/schedulercbsgetexecutiontime.c
index 825c18efe3..829cb77e0f 100644
--- a/cpukit/score/src/schedulercbsgetexecutiontime.c
+++ b/cpukit/score/src/schedulercbsgetexecutiontime.c
@@ -64,7 +64,7 @@ int _Scheduler_CBS_Get_execution_time (
     return SCHEDULER_CBS_ERROR_NOSERVER;
   }
 
-  if ( server->task_id == -1 ) {
+  if ( server->task_id == (rtems_id)-1 ) {
     *exec_time = 0;
     return SCHEDULER_CBS_OK;
   }
diff --git a/cpukit/score/src/schedulercbssetparameters.c b/cpukit/score/src/schedulercbssetparameters.c
index 718cee3626..627f97c70b 100644
--- a/cpukit/score/src/schedulercbssetparameters.c
+++ b/cpukit/score/src/schedulercbssetparameters.c
@@ -52,8 +52,8 @@ int _Scheduler_CBS_Set_parameters (
 
   if ( params->budget <= 0 ||
        params->deadline <= 0 ||
-       params->budget >= SCHEDULER_EDF_PRIO_MSB ||
-       params->deadline >= SCHEDULER_EDF_PRIO_MSB )
+       params->budget >= (time_t)SCHEDULER_EDF_PRIO_MSB ||
+       params->deadline >= (time_t)SCHEDULER_EDF_PRIO_MSB )
     return SCHEDULER_CBS_ERROR_INVALID_PARAMETER;
 
   if ( !_Scheduler_CBS_Server_list[server_id].initialized )