diff --git a/m4/check-decl.m4 b/m4/check-decl.m4
index 544f15d66..d72218574 100644
--- a/m4/check-decl.m4
+++ b/m4/check-decl.m4
@@ -39,7 +39,7 @@ AC_DEFUN(jm_CHECK_DECLS,
 #endif
 '
 
-  AC_CHECK_DECLS((free, lseek, malloc, memchr, nanosleep,
+  AC_CHECK_DECLS((free, getenv, lseek, malloc, memchr, nanosleep,
                   realloc, stpcpy, strstr, strtoul, strtoull),
                   , , $headers)
 ])