Index: src/platform/posix/thread.m
==================================================================
--- src/platform/posix/thread.m
+++ src/platform/posix/thread.m
@@ -125,20 +125,27 @@
 
 	@try {
 		struct thread_ctx *ctx;
 
 		if (attr != NULL && POSIXAttrAvailable) {
+#ifndef OF_HPUX
 			struct sched_param param;
+#endif
 
 			if (attr->priority < -1 || attr->priority > 1)
 				return EINVAL;
 
-#ifdef HAVE_PTHREAD_ATTR_SETINHERITSCHED
+#ifndef OF_HPUX
+# ifdef HAVE_PTHREAD_ATTR_SETINHERITSCHED
 			if ((error = pthread_attr_setinheritsched(&POSIXAttr,
 			    PTHREAD_EXPLICIT_SCHED)) != 0)
 				return error;
-#endif
+# endif
+
+			if ((error = pthread_attr_getschedparam(&POSIXAttr,
+			    &param)) != 0)
+				return error;
 
 			if (attr->priority < 0) {
 				param.sched_priority = minPrio +
 				    (1.0f + attr->priority) *
 				    (normalPrio - minPrio);
@@ -147,10 +154,11 @@
 				    attr->priority * (maxPrio - normalPrio);
 
 			if ((error = pthread_attr_setschedparam(&POSIXAttr,
 			    &param)) != 0)
 				return error;
+#endif
 
 			if (attr->stackSize > 0) {
 				if ((error = pthread_attr_setstacksize(
 				    &POSIXAttr, attr->stackSize)) != 0)
 					return error;