diff --git a/code/qcommon/vm_x86.c b/code/qcommon/vm_x86.c
index d839ddea..32be49cd 100644
--- a/code/qcommon/vm_x86.c
+++ b/code/qcommon/vm_x86.c
@@ -1702,6 +1702,10 @@ This function is called directly by the generated code
 ==============
 */
 
+#if defined(_MSC_VER) && defined(idx64)
+extern uint8_t qvmcall64(int *programStack, int *opStack, intptr_t *instructionPointers, byte *dataBase);
+#endif
+
 int VM_CallCompiled(vm_t *vm, int *args)
 {
 	byte	stack[OPSTACK_SIZE + 15];