diff --git a/libs/x86emu/ops2.c b/libs/x86emu/ops2.c
index 06b7f56..17dfae7 100644
--- a/libs/x86emu/ops2.c
+++ b/libs/x86emu/ops2.c
@@ -381,6 +381,8 @@ static void x86emuOp2_pop_FS(u8 X86EMU_UNUSED(op2))
     END_OF_INSTR();
 }
 
+void cpuid(void);
+
 /****************************************************************************
 REMARKS: CPUID takes EAX/ECX as inputs, writes EAX/EBX/ECX/EDX as output
 Handles opcode 0x0f,0xa2