diff --git a/genplus-gx/cinterface/zap.c b/genplus-gx/cinterface/zap.c
index 7c792f68b3..4802b5ee56 100644
--- a/genplus-gx/cinterface/zap.c
+++ b/genplus-gx/cinterface/zap.c
@@ -464,17 +464,18 @@ void zap(void)
 	Y(zbank_memory_map);
 	
 	Z(&sram); // NB: sram.sram is not allocated
-	
+
 	Z(&svp);
 	
 	Z(&bitmap);
 	Z(&snd);
+
 	Z(&mcycles_vdp);
-	Z(&SVP_cycles);
+
 	Z(&system_hw);
 	Z(&system_bios);
 	Z(&system_clock);
-	
+
 	Y(reg);
 	Y(sat);
 	Y(vram);
@@ -591,6 +592,5 @@ void zap(void)
 	Z(&eq);
 	Z(&llp);
 	Z(&rrp);
-
 }
 
diff --git a/genplus-gx/core/system.c b/genplus-gx/core/system.c
index cbd0b513ac..e828636e17 100644
--- a/genplus-gx/core/system.c
+++ b/genplus-gx/core/system.c
@@ -49,7 +49,7 @@ uint32 mcycles_vdp;
 uint8 system_hw;
 uint8 system_bios;
 uint32 system_clock;
-int16 SVP_cycles = 800; 
+const int16 SVP_cycles = 800; 
 
 uint8 pause_b;
 EQSTATE eq;
diff --git a/genplus-gx/core/system.h b/genplus-gx/core/system.h
index b679421f97..3002a2c6ef 100644
--- a/genplus-gx/core/system.h
+++ b/genplus-gx/core/system.h
@@ -98,7 +98,7 @@ typedef struct
 extern t_bitmap bitmap;
 extern t_snd snd;
 extern uint32 mcycles_vdp;
-extern int16 SVP_cycles; 
+extern const int16 SVP_cycles; 
 extern uint8 system_hw;
 extern uint8 system_bios;
 extern uint32 system_clock;
diff --git a/output/dll/libgenplusgx.dll b/output/dll/libgenplusgx.dll
index 57b88b2ac2..8adf255056 100644
Binary files a/output/dll/libgenplusgx.dll and b/output/dll/libgenplusgx.dll differ