diff --git a/libgimpbase/gimpreloc.c b/libgimpbase/gimpreloc.c
index 7ed1783b3c7d5b78ba55ed97427c676bfa98e9b4..dec6ea769f49d3896a922563c3db7db8bd8337a2 100644
--- a/libgimpbase/gimpreloc.c
+++ b/libgimpbase/gimpreloc.c
@@ -27,6 +27,9 @@
 
 #include "gimpreloc.h"
 
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
 
 /*
  * Find the canonical filename of the executable. Returns the filename
diff --git a/plug-ins/common/qbist.c b/plug-ins/common/qbist.c
index c1bcdf21227acedf777914acbacfdd441a65ae37..0611a8aa87c8828e5c50782f0f97233d7c98048a 100644
--- a/plug-ins/common/qbist.c
+++ b/plug-ins/common/qbist.c
@@ -38,6 +38,9 @@
 
 #include "libgimp/stdplugins-intl.h"
 
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
 
 #define MAX_TRANSFORMS  36
 #define NUM_REGISTERS    6