diff --git a/src/386.c b/src/386.c
index 38cc07c..d4d7bd6 100644
--- a/src/386.c
+++ b/src/386.c
@@ -38,7 +38,6 @@ int cgate32;
 
 uint8_t romext[32768];
 uint8_t *ram,*rom;
-uint16_t biosmask;
 
 uint32_t rmdat32;
 #define rmdat rmdat32
diff --git a/src/386_dynarec.c b/src/386_dynarec.c
index 6dbf24f..4951ccd 100644
--- a/src/386_dynarec.c
+++ b/src/386_dynarec.c
@@ -46,7 +46,6 @@ int cgate32;
 
 uint8_t romext[32768];
 uint8_t *ram,*rom;
-uint16_t biosmask;
 
 uint32_t rmdat32;
 uint32_t backupregs[16];
diff --git a/src/mem.h b/src/mem.h
index e642185..99b5c4a 100644
--- a/src/mem.h
+++ b/src/mem.h
@@ -34,6 +34,7 @@ extern uint8_t romext[32768];
 extern int readlnum,writelnum;
 extern int memspeed[11];
 extern int nopageerrors;
+extern uint32_t biosmask;
 
 void mem_mapping_add(mem_mapping_t *mapping,
                     uint32_t base,