diff --git a/src/addresses.h b/src/addresses.h
index 5a258b87d6..665747655f 100644
--- a/src/addresses.h
+++ b/src/addresses.h
@@ -470,6 +470,7 @@ static int RCT2_CALLPROC_X(int address, int _eax, int _ebx, int _ecx, int _edx,
 		mov edi, %[_edi] 	\n\
 		mov ebp, %[_ebp] 	\n\
 		call [esp] 	\n\
+		lahf \n\
 		add esp, 4 	\n\
 		pop ebp \n\
 		pop ebx \n\