diff --git a/lib/roken/roken-common.h b/lib/roken/roken-common.h
index 55a0d321a..1116a567d 100644
--- a/lib/roken/roken-common.h
+++ b/lib/roken/roken-common.h
@@ -376,7 +376,7 @@ int ROKEN_LIB_FUNCTION
 read_environment(const char *file, char ***env);
 
 void ROKEN_LIB_FUNCTION
-free_environment(char **, int);
+free_environment(char **);
 
 void ROKEN_LIB_FUNCTION
 warnerr(int doerrno, const char *fmt, va_list ap)