diff --git a/src/cpu/core_normal/prefix_none.h b/src/cpu/core_normal/prefix_none.h
index d0e73555..24e6c177 100644
--- a/src/cpu/core_normal/prefix_none.h
+++ b/src/cpu/core_normal/prefix_none.h
@@ -433,11 +433,13 @@
 			if (rm >= 0xc0 ) {GetEArb;*earb=*rmrb;}
 			else {
 				if (cpu.pmode) {
-					Descriptor desc;
-					cpu.gdt.GetDescriptor(SegValue(core.base_val_ds),desc);
-					if ((desc.Type()==DESC_CODE_R_NC_A) || (desc.Type()==DESC_CODE_R_NC_NA)) {
-						CPU_Exception(EXCEPTION_GP,SegValue(core.base_val_ds) & 0xfffc);
-						continue;
+					if (GCC_UNLIKELY((rm==0x05) && (!cpu.code.big))) {
+						Descriptor desc;
+						cpu.gdt.GetDescriptor(SegValue(core.base_val_ds),desc);
+						if ((desc.Type()==DESC_CODE_R_NC_A) || (desc.Type()==DESC_CODE_R_NC_NA)) {
+							CPU_Exception(EXCEPTION_GP,SegValue(core.base_val_ds) & 0xfffc);
+							continue;
+						}
 					}
 				}
 				GetEAa;SaveMb(eaa,*rmrb);