diff --git a/source/state.c b/source/state.c
index fad6945..f8a4f51 100644
--- a/source/state.c
+++ b/source/state.c
@@ -149,6 +149,12 @@ int state_load(unsigned char *state)
     load_param(&tmp32, 4); m68k_set_reg(M68K_REG_PC, tmp32);  
     load_param(&tmp16, 2); m68k_set_reg(M68K_REG_SR, tmp16);
     load_param(&tmp32, 4); m68k_set_reg(M68K_REG_USP,tmp32);
+
+    /* 1.6.1 specific (keep support for previous state format) */
+    if ((version[11] == 0x31) && (version[13] == 0x36) && (version[15] == 0x31))
+    {
+      load_param(&tmp32, 4); m68k_set_reg(M68K_REG_ISP,tmp32);
+    }
   }
 
   /* Z80 */ 
@@ -242,6 +248,7 @@ int state_save(unsigned char *state)
     tmp32 = m68k_get_reg(M68K_REG_PC);  save_param(&tmp32, 4);
     tmp16 = m68k_get_reg(M68K_REG_SR);  save_param(&tmp16, 2); 
     tmp32 = m68k_get_reg(M68K_REG_USP); save_param(&tmp32, 4);
+    tmp32 = m68k_get_reg(M68K_REG_ISP); save_param(&tmp32, 4);
   }
 
   /* Z80 */