diff --git a/src/tools/gensyscalls/arch/x86_64/arch_gensyscalls.h b/src/tools/gensyscalls/arch/x86_64/arch_gensyscalls.h
new file mode 100644
index 0000000000..620802d3a9
--- /dev/null
+++ b/src/tools/gensyscalls/arch/x86_64/arch_gensyscalls.h
@@ -0,0 +1,2 @@
+#define SYSCALL_RETURN_TYPE_ALIGNMENT_TYPE	long
+#define SYSCALL_PARAMETER_ALIGNMENT_TYPE	long