diff --git a/SheepShaver/src/Unix/sysdeps.h b/SheepShaver/src/Unix/sysdeps.h
index cd4d7763..224bcf9e 100644
--- a/SheepShaver/src/Unix/sysdeps.h
+++ b/SheepShaver/src/Unix/sysdeps.h
@@ -77,6 +77,10 @@
 #else
 # define ROM_IS_WRITE_PROTECTED 1
 #endif
+// Configure PowerPC emulator
+#define PPC_NO_LAZY_PC_UPDATE 1
+#define PPC_NO_DECODE_CACHE 1
+//#define PPC_FLIGHT_RECORDER 1
 #else
 // Mac ROM is write protected
 #define ROM_IS_WRITE_PROTECTED 1