diff --git a/common/arg.cpp b/common/arg.cpp
index cdf897025..642fefb57 100644
--- a/common/arg.cpp
+++ b/common/arg.cpp
@@ -163,6 +163,8 @@ struct common_hf_file_res {
 #   if !defined(PATH_MAX)
 #   define PATH_MAX MAX_PATH
 #   endif
+#elif defined(_AIX)
+#include <sys/limits.h>
 #else
 #include <sys/syslimits.h>
 #endif