diff --git a/configure.ac b/configure.ac
index f4222317b..592f3179e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -225,11 +225,13 @@ if test $jm_cv_sys_tiocgwinsz_needs_termios_h = no && \
 fi
 
 # For src/kill.c.
-AC_CHECK_DECLS([strtoimax])
 AC_CHECK_DECLS([strsignal, sys_siglist, _sys_siglist, __sys_siglist], , ,
   [AC_INCLUDES_DEFAULT
 #include <signal.h>])
 
+# For src/kill.c and src/printf.c.
+AC_CHECK_DECLS([strtoimax, strtoumax])
+
 gl_LIB_CHECK
 
 AM_GNU_GETTEXT([external], [need-ngettext])