diff --git a/kernel/yosys.h b/kernel/yosys.h
index aab6b584..ae73146b 100644
--- a/kernel/yosys.h
+++ b/kernel/yosys.h
@@ -64,6 +64,7 @@
 #include <string.h>
 #include <stdint.h>
 #include <stdio.h>
+#include <limits.h>
 
 #ifndef _YOSYS_
 #  error It looks like you are trying to build Yosys without the config defines set. \
@@ -100,6 +101,10 @@
 #  endif
 #endif
 
+#ifndef PATH_MAX
+#  define PATH_MAX 4096
+#endif
+
 #define PRIVATE_NAMESPACE_BEGIN  namespace {
 #define PRIVATE_NAMESPACE_END    }
 #define YOSYS_NAMESPACE_BEGIN    namespace Yosys {