diff --git a/configure b/configure
index 003dc6e42..b5d57d6dc 100755
--- a/configure
+++ b/configure
@@ -31515,7 +31515,7 @@ else case e in #(
 int
 main (void)
 {
-(void)ldap_init(0, 0)
+return ldap_msgfree(NULL)
   ;
   return 0;
 }
diff --git a/m4/ldap.m4 b/m4/ldap.m4
index 68aca3922..39f2e352e 100644
--- a/m4/ldap.m4
+++ b/m4/ldap.m4
@@ -52,7 +52,7 @@ AC_DEFUN([SUDO_CHECK_LDAP], [
 #include <lber.h>])
 	AC_CACHE_CHECK([whether lber.h is needed when including ldap.h], [sudo_cv_header_lber_h], [
 	    AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
-#include <ldap.h>]], [[(void)ldap_init(0, 0)]])], [
+#include <ldap.h>]], [[return ldap_msgfree(NULL)]])], [
 		# No need to explicitly include lber.h when including ldap.h.
 		sudo_cv_header_lber_h=no
 	    ], [