diff --git a/Core/HLE/sceKernelThread.cpp b/Core/HLE/sceKernelThread.cpp
index 8b2e6c3c6f..6784bab6ce 100644
--- a/Core/HLE/sceKernelThread.cpp
+++ b/Core/HLE/sceKernelThread.cpp
@@ -859,7 +859,7 @@ u32 sceKernelStartThread()
 
 		startThread->nt.status = THREADSTATUS_READY;
 		u32 sp = startThread->context.r[MIPS_REG_SP];
-		if (argBlockPtr)
+		if (argBlockPtr && argSize > 0)
 		{
 			startThread->context.r[MIPS_REG_A0] = argSize;
 			startThread->context.r[MIPS_REG_A1] = sp; 
diff --git a/pspautotests b/pspautotests
index 3024341543..e6dfb3f2c2 160000
--- a/pspautotests
+++ b/pspautotests
@@ -1 +1 @@
-Subproject commit 3024341543e8f6a338d793bbc8701ea55e2d5c99
+Subproject commit e6dfb3f2c2ad71475aaad2d7c6807e91b64e5ab1
diff --git a/test.py b/test.py
index bf70d1a52c..c6bde8cac7 100644
--- a/test.py
+++ b/test.py
@@ -31,6 +31,7 @@ tests_good = [
   "string/string",
   "gpu/callbacks/ge_callbacks",
   "threads/mbx/mbx",
+  "threads/semaphores/semaphores",
   "power/power",
   "rtc/rtc",
   "umd/callbacks/umd",
@@ -55,7 +56,6 @@ tests_good = [
   "threads/msgpipe/msgpipe",
   "threads/mutex/mutex",
   "threads/scheduling/scheduling",
-  "threads/semaphores/semaphores",
   "threads/threads/threads",
   "threads/vpl/vpl",
   "threads/vtimers/vtimers",