diff --git a/thread/common/omrthreadattr.c b/thread/common/omrthreadattr.c
index b792a5c9fc8..8723cc7c458 100644
--- a/thread/common/omrthreadattr.c
+++ b/thread/common/omrthreadattr.c
@@ -33,7 +33,7 @@
 #include "omrthreadattr.h"
 
 #define J9THREAD_ATTR_IS_VALID(attr) ((attr) && (*(attr)) && ((*(attr))->size == sizeof(omrthread_attr)))
-#define J9THREAD_VALUE_OUT_OF_RANGE(val, lo, hi) (((val) < (lo)) || ((val) > (hi)))
+#define J9THREAD_VALUE_WITHIN_RANGE(val, lo, hi) (((val) >= (lo)) && ((val) <= (hi)))
 
 static intptr_t failedToSetAttr(intptr_t rc);
 
@@ -220,7 +220,7 @@ omrthread_attr_set_priority(omrthread_attr_t *attr, omrthread_prio_t priority)
 		return J9THREAD_ERR_INVALID_ATTR;
 	}
 
-	if (J9THREAD_VALUE_OUT_OF_RANGE(priority, J9THREAD_PRIORITY_MIN, J9THREAD_PRIORITY_MAX)) {
+	if (!J9THREAD_VALUE_WITHIN_RANGE(priority, J9THREAD_PRIORITY_MIN, J9THREAD_PRIORITY_MAX)) {
 		return J9THREAD_ERR_INVALID_VALUE;
 	}
 
diff --git a/thread/unix/omrthreadattr.c b/thread/unix/omrthreadattr.c
index 8fd2b786ca5..d79e6b7973d 100644
--- a/thread/unix/omrthreadattr.c
+++ b/thread/unix/omrthreadattr.c
@@ -39,7 +39,7 @@
 #include "unix/unixthreadattr.h"
 
 #define J9THREAD_ATTR_IS_VALID(attr) ((attr) && (*(attr)) && ((*(attr))->size == sizeof(unixthread_attr)))
-#define J9THREAD_VALUE_OUT_OF_RANGE(val, lo, hi) (((val) < (lo)) || ((val) > (hi)))
+#define J9THREAD_VALUE_WITHIN_RANGE(val, lo, hi) (((val) >= (lo)) && ((val) <= (hi)))
 
 static intptr_t setStacksize(pthread_attr_t *pattr, uintptr_t stacksize);
 static intptr_t setPriority(pthread_attr_t *pattr, omrthread_prio_t priority);
@@ -288,7 +288,7 @@ omrthread_attr_set_priority(omrthread_attr_t *attr, omrthread_prio_t priority)
 		return J9THREAD_SUCCESS;
 	}
 
-	if (J9THREAD_VALUE_OUT_OF_RANGE(priority, J9THREAD_PRIORITY_MIN, J9THREAD_PRIORITY_MAX)) {
+	if (!J9THREAD_VALUE_WITHIN_RANGE(priority, J9THREAD_PRIORITY_MIN, J9THREAD_PRIORITY_MAX)) {
 		return J9THREAD_ERR_INVALID_VALUE;
 	}
 
diff --git a/thread/zos390/omrthreadattr.c b/thread/zos390/omrthreadattr.c
index b60727387e4..3ad1c744258 100644
--- a/thread/zos390/omrthreadattr.c
+++ b/thread/zos390/omrthreadattr.c
@@ -32,7 +32,7 @@
 #include "unix/unixthreadattr.h"
 
 #define J9THREAD_ATTR_IS_VALID(attr) ((attr) && (*(attr)) && ((*(attr))->size == sizeof(unixthread_attr)))
-#define J9THREAD_VALUE_OUT_OF_RANGE(val, lo, hi) (((val) < (lo)) || ((val) > (hi)))
+#define J9THREAD_VALUE_WITHIN_RANGE(val, lo, hi) (((val) >= (lo)) && ((val) <= (hi)))
 
 static intptr_t failedToSetAttr(intptr_t rc);
 
@@ -229,7 +229,7 @@ omrthread_attr_set_priority(omrthread_attr_t *attr, omrthread_prio_t priority)
 		return J9THREAD_ERR_INVALID_ATTR;
 	}
 
-	if (J9THREAD_VALUE_OUT_OF_RANGE(priority, J9THREAD_PRIORITY_MIN, J9THREAD_PRIORITY_MAX)) {
+	if (!J9THREAD_VALUE_WITHIN_RANGE(priority, J9THREAD_PRIORITY_MIN, J9THREAD_PRIORITY_MAX)) {
 		return J9THREAD_ERR_INVALID_VALUE;
 	}