diff --git a/catatonit.c b/catatonit.c
index db972d6..51d530b 100644
--- a/catatonit.c
+++ b/catatonit.c
@@ -34,6 +34,8 @@
 
 #include "config.h"
 
+extern char **__environ;
+
 static enum loglevel_t {
 	LOG_FATAL = 0,
 	LOG_ERROR = 1,