diff --git a/guile-readline/configure.in b/guile-readline/configure.in
index 7a947d079..1260bc338 100644
--- a/guile-readline/configure.in
+++ b/guile-readline/configure.in
@@ -22,7 +22,7 @@ AC_CACHE_CHECK([for rl_getc_function pointer in readline],
 		 [AC_TRY_LINK([
 #include <stdio.h>
 #include <readline/readline.h>],
-			      [rl_getc_function;],
+			      [printf ("%ld", (long) rl_getc_function)],
 			      [ac_cv_var_rl_getc_function=yes],
 			      [ac_cv_var_rl_getc_function=no])])
 if test "${ac_cv_var_rl_getc_function}" = "yes"; then