diff --git a/Core/HLE/sceKernelThread.cpp b/Core/HLE/sceKernelThread.cpp
index fd2d2d2cf7..92b21feec2 100644
--- a/Core/HLE/sceKernelThread.cpp
+++ b/Core/HLE/sceKernelThread.cpp
@@ -2139,7 +2139,10 @@ int __KernelCreateThread(const char *threadName, SceUID moduleID, u32 entry, u32
 		WARN_LOG_REPORT(Log::sceKernel, "bogus thread stack size %08x", stacksize);
 		return SCE_KERNEL_ERROR_ILLEGAL_STACK_SIZE;
 	}
-	if (prio < 0x08 || prio > 0x77) {
+	// A kernel caller may also use 0x01-0x07 and 0x78-0x7E (threads/threads/kernel/priority).
+	const u32 minPrio = allowKernel ? 0x01 : 0x08;
+	const u32 maxPrio = allowKernel ? 0x7E : 0x77;
+	if (prio < minPrio || prio > maxPrio) {
 		WARN_LOG(Log::sceKernel, "bogus thread priority %08x", prio);
 		return SCE_KERNEL_ERROR_ILLEGAL_PRIORITY;
 	}
diff --git a/pspautotests b/pspautotests
index 704b88a913..0e251f7c4b 160000
--- a/pspautotests
+++ b/pspautotests
@@ -1 +1 @@
-Subproject commit 704b88a913311ea6d2beb97cbdd66b2ca5182c72
+Subproject commit 0e251f7c4b12ca461f12de4a608e5acd4463fcc5
diff --git a/test.py b/test.py
index 2cc0c7c3b4..c71e10c9bf 100755
--- a/test.py
+++ b/test.py
@@ -487,6 +487,7 @@ tests_good = [
   "threads/tls/create",
   "threads/tls/partition",
   "threads/tls/kernel/partition",
+  "threads/threads/kernel/priority",
   "threads/tls/delete",
   "threads/tls/get",
   "threads/tls/free",