diff --git a/src/Filesystem.cc b/src/Filesystem.cc
index 2e1f206af..5096a6427 100644
--- a/src/Filesystem.cc
+++ b/src/Filesystem.cc
@@ -55,6 +55,11 @@
 
 #include "sdf/Filesystem.hh"
 
+/* PATH_MAX is undefined on GNU Hurd */
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
 namespace sdf
 {
 inline namespace SDF_VERSION_NAMESPACE {
diff --git a/src/Filesystem_TEST.cc b/src/Filesystem_TEST.cc
index a0b0ea87c..e96cc0198 100644
--- a/src/Filesystem_TEST.cc
+++ b/src/Filesystem_TEST.cc
@@ -25,6 +25,11 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+/* PATH_MAX is undefined on GNU Hurd */
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
 /////////////////////////////////////////////////
 bool create_and_switch_to_temp_dir(std::string &_new_temp_path)
 {