diff --git a/src/nnn.c b/src/nnn.c
index 20a6051e..1c12e1cd 100644
--- a/src/nnn.c
+++ b/src/nnn.c
@@ -202,12 +202,14 @@
 #define CTX_MAX 8
 #endif
 
+#ifndef SED
 /* BSDs or Solaris or SunOS */
 #if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__) || defined(sun) || defined(__sun)
 #define SED "gsed"
 #else
 #define SED "sed"
 #endif
+#endif
 
 /* Large selection threshold */
 #ifndef LARGESEL