diff --git a/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-cpu.cpp b/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-cpu.cpp
index eefa1f95..39a31ecb 100644
--- a/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-cpu.cpp
+++ b/SheepShaver/src/kpx_cpu/src/cpu/ppc/ppc-cpu.cpp
@@ -372,6 +372,7 @@ powerpc_cpu::powerpc_cpu(task_struct *parent_task)
 #if PPC_ENABLE_JIT
 	use_jit = false;
 #endif
+	spcflags().init();
 	++ppc_refcount;
 	initialize();
 }
diff --git a/SheepShaver/src/kpx_cpu/src/cpu/spcflags.hpp b/SheepShaver/src/kpx_cpu/src/cpu/spcflags.hpp
index 0b521d53..d379f1cb 100644
--- a/SheepShaver/src/kpx_cpu/src/cpu/spcflags.hpp
+++ b/SheepShaver/src/kpx_cpu/src/cpu/spcflags.hpp
@@ -41,8 +41,10 @@ class basic_spcflags
 public:
 
 	basic_spcflags()
-		: mask(0), lock(SPIN_LOCK_UNLOCKED)
-		{ }
+		{ init(); }
+
+	void init()
+		{ mask = 0; lock = SPIN_LOCK_UNLOCKED; }
 
 	bool empty() const
 		{ return (mask == 0); }